如何制作圆形背景？

Question

我想制作如图所示的圆形背景：

• desktop version
• mobile version

但是，我不知道如何在 HTML 和 CSS 中制作正确的结构。我从移动开始，然后我想扩展到更大的尺寸。我的问题是我不知道如何使圆圈具有响应性并使其在图片上看起来像，尤其是在移动版本上。我不确定是否应该将 ::after 用于圆圈，但在我的示例中，我在 div 上有绝对位置，所以我真的不能。

header {
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  position: -webkit-sticky;
  position: sticky;
  width: 100%;
  padding: 1em 3em;
  min-height: 8vh;
  text-align: center;
  top: 0;
  z-index: 4;
  background-color: white;
}

header img {
  width: 8em;
}

header ul {
  list-style: none;
}

header ul li {
  display: inline-block;
  padding: 1em 2em;
  color: white;
  position: relative;
  overflow: hidden;
  will-change: transform;
}

header ul li a {
  text-decoration: none;
  color: black;
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 1.8rem);
}

header .burger {
  display: none;
}

@media only screen and (max-width: 996px) {
  header .burger {
    display: block;
    width: 4em;
    cursor: pointer;
  }
  header .burger img {
    width: 3em;
  }
  header ul {
    display: none;
  }
}

@media only screen and (max-width: 1022px) {
  .overlay {
    position: fixed;
    z-index: 4;
    width: 100%;
    height: 100%;
    padding: 2em;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: white;
    -webkit-transform: translateY(100%);
    transform: translateY(100%);
    overflow-y: scroll;
  }
  .overlay .close {
    position: absolute;
    top: 2em;
    right: 2em;
    width: 3em;
    height: 3em;
    cursor: pointer;
  }
  .overlay img {
    width: 10em;
  }
  .overlay .overlay-list {
    list-style-type: none;
    text-align: center;
  }
  .overlay .overlay-list li {
    color: black;
    font-size: 2rem;
    font-family: Josefin Sans;
    padding: .6em 0;
  }
  .overlay .overlay-list li a {
    text-decoration: none;
    color: black;
  }
}

@media only screen and (min-width: 1024px) {
  .overlay {
    display: none;
  }
}

* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  font-family: "Raleway", sans-serif;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
}

.hero {
  width: 100%;
  min-height: 100vh;
  background: transparent -webkit-gradient(linear, left top, left bottom, from(#def0d8), to(var(--unnamed-color-fafafa))) 0% 0% no-repeat padding-box;
  background: transparent linear-gradient(180deg, #def0d8 0%, var(--unnamed-color-fafafa) 100%) 0% 0% no-repeat padding-box;
  background: transparent -webkit-gradient(linear, left top, left bottom, from(#def0d8), to(#fafafa)) 0% 0% no-repeat padding-box;
  background: transparent linear-gradient(180deg, #def0d8 0%, #fafafa 100%) 0% 0% no-repeat padding-box;
  z-index: 1;
  position: relative;
}

.hero__container {
  padding: 2em;
  height: 70vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  position: relative;
  z-index: 4;
  overflow: hidden;
}

.hero__container::after {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  z-index: -1;
  top: 0;
  left: 0;
  background-color: #387546;
  border-radius: 0 0 0 60%;
}

.hero__container .food-bg {
  background-image: url("../images/background+pict.png");
  background-position: top;
  background-repeat: no-repeat;
  background-size: contain;
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 1;
  right: -36%;
}

.hero__container .left-col {
  width: 68%;
  z-index: 2;
}

.hero__container .left-col h1 {
  color: white;
  margin-bottom: .7em;
}

.hero__container .left-col p {
  color: white;
  margin-bottom: 2em;
  width: 70%;
}

.btn {
  text-decoration: none;
  color: white;
  padding: .7em 0.7em .7em 1em;
  border-radius: .8em;
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

.btn__gold {
  background-color: #f19a33;
}

.button__icon {
  width: 1.5em;
  height: 1.5em;
  fill: currentcolor;
  margin-left: 1em;
}


/*# sourceMappingURL=main.css.map */

<link href="https://fonts.googleapis.com/css2?family=Raleway:wght@400;500;700;900&display=swap" rel="stylesheet">
<div class="overlay">
  <a href="">
    <img src="images/wrapped_green_logo@2x.png" class="overlay-logo" alt="logo">
  </a>
  <img src="/images/icon-close.svg" class="close" alt="close">
  <ul class="overlay-list">
    <li><a href="about">About us</a></li>
    <li><a href="menu">Menu</a></li>
    <li><a href="contact">Contact</a></li>
  </ul>
</div>
<header>
  <a href="">
    <img src="images/wrapped_green_logo@2x.png" class="header-logo" alt="logo">
  </a>
  <nav>
    <ul class="header-links">
      <li><a href="about">About us</a></li>
      <li><a href="menu">Menu</a></li>
      <li><a href="contact">Contact</a></li>
    </ul>
    <div class="burger">
      <img src="images/icon-hamburger.svg" alt="hamburger-icon">
    </div>
  </nav>
</header>
<div class="hero">
  <div class="hero__container">
    <div class="left-col">
      <h1>Healthy & Fresh Food For You</h1>
      <p>Created for lover of healty, delicious and non-obvious food</p>
      <a href="" class="btn btn__gold">Check Menu<svg xmlns="http://www.w3.org/2000/svg" class="button__icon" viewBox="0 0 30 24" width="50" height="20"><path fill="none" d="M0 0h24v24H0z"/><path d="M16.172 11l-5.364-5.364 1.414-1.414L20 12l-7.778 7.778-1.414-1.414L16.172 13H4v-2z" fill="rgba(255,255,255,1)"/></svg> </a>
    </div>
    <div class="food-bg"></div>
  </div>
</div>

Answer 1

这是一个简单的解决方案。还有很多其他的。

.wrapper {
  width: 90%;
  height: 400px;
  overflow: hidden;
  background: lightgreen;
  box-shadow: 1px 1px 5px 2px rgba(0,0,0,0.4);
}

nav {
  width: 100%;
  height: 60px;
  background: #fff;
  position: relative;
  z-index: 20;
  border-bottom: 1px solid black;
}

.background {
  position: relative;
  width: 100%;
  height: 0;
  right: 0;
}

.background > div {
  position: absolute;
  right: -50px;
  top: -20px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: green;
}

<div class="wrapper">
  <div class="background">
    <div></div>
  </div>
  <nav>Menu</nav>
</div>

Answer 2

有很多方法可以做到这一点，这里是一种。为简洁起见，只添加了一个断点，对于移动设备，假设这是一个没有滚动内容的介绍屏幕，因此背景将适应视口大小。您可能需要添加一些调整以使其达到每个断点所需的位置：

header {
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  position: -webkit-sticky;
  position: sticky;
  width: 100%;
  padding: 1em 3em;
  min-height: 8vh;
  text-align: center;
  top: 0;
  z-index: 4;
  background-color: white;
}

header img {
  width: 8em;
}

header ul {
  list-style: none;
}

header ul li {
  display: inline-block;
  padding: 1em 2em;
  color: white;
  position: relative;
  overflow: hidden;
  will-change: transform;
}

header ul li a {
  text-decoration: none;
  color: black;
  font-weight: 700;
  font-size: clamp(1.5rem, 5vw, 1.8rem);
}

header .burger {
  display: none;
}

* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

body {
  font-family: "Raleway", sans-serif;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
}

.hero {
  width: 100%;
  min-height: 100vh;
  background: transparent -webkit-gradient(linear, left top, left bottom, from(#def0d8), to(var(--unnamed-color-fafafa))) 0% 0% no-repeat padding-box;
  background: transparent linear-gradient(180deg, #def0d8 0%, var(--unnamed-color-fafafa) 100%) 0% 0% no-repeat padding-box;
  background: transparent -webkit-gradient(linear, left top, left bottom, from(#def0d8), to(#fafafa)) 0% 0% no-repeat padding-box;
  background: transparent linear-gradient(180deg, #def0d8 0%, #fafafa 100%) 0% 0% no-repeat padding-box;
  z-index: 1;
  position: relative;
}

.hero__container {
  padding: 2em;
  height: 90vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  position: relative;
  z-index: 4;
  overflow: hidden;
}

.hero__container::after {
  content: '';
  position: absolute;
  width: 300vw;
  height: 300vw;
  z-index: -1;
  top: -170vw;
  right: -160vw;
  background-color: #387546;
  border-radius: 50%;
}

.hero__container .food-bg {
  background-image: url("../images/background+pict.png");
  background-position: top;
  background-repeat: no-repeat;
  background-size: contain;
  position: absolute;
  width: 100%;
  height: 100%;
  z-index: 1;
  right: -36%;
}

.hero__container .left-col {
  width: 68%;
  z-index: 2;
}

.hero__container .left-col h1 {
  color: white;
  margin-bottom: .7em;
}

.hero__container .left-col p {
  color: white;
  margin-bottom: 2em;
  width: 70%;
}

.btn {
  text-decoration: none;
  color: white;
  padding: .7em 0.7em .7em 1em;
  border-radius: .8em;
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
}

.btn__gold {
  background-color: #f19a33;
}

.button__icon {
  width: 1.5em;
  height: 1.5em;
  fill: currentcolor;
  margin-left: 1em;
}


/*Responsive Styles*/

@media only screen and (max-width: 996px) {
  header .burger {
    display: block;
    width: 4em;
    cursor: pointer;
  }
  header .burger img {
    width: 3em;
  }
  header ul {
    display: none;
  }
}

@media only screen and (max-width: 1022px) {
  .overlay {
    position: fixed;
    z-index: 4;
    width: 100%;
    height: 100%;
    padding: 2em;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: white;
    -webkit-transform: translateY(100%);
    transform: translateY(100%);
    overflow-y: scroll;
  }
  .overlay .close {
    position: absolute;
    top: 2em;
    right: 2em;
    width: 3em;
    height: 3em;
    cursor: pointer;
  }
  .overlay img {
    width: 10em;
  }
  .overlay .overlay-list {
    list-style-type: none;
    text-align: center;
  }
  .overlay .overlay-list li {
    color: black;
    font-size: 2rem;
    font-family: Josefin Sans;
    padding: .6em 0;
  }
  .overlay .overlay-list li a {
    text-decoration: none;
    color: black;
  }
}

@media only screen and (min-width: 1024px) {
  .overlay {
    display: none;
  }
  .hero__container {
    height: 70vh;
  }
  .hero__container::after {
    width: 900px;
    height: 900px;
    z-index: -1;
    top: 0;
    top: -240px;
    right: -120px;
  }
}

<div class="overlay">
  <a href="">
    <img src="images/wrapped_green_logo@2x.png" class="overlay-logo" alt="logo">
  </a>
  <img src="/images/icon-close.svg" class="close" alt="close">
  <ul class="overlay-list">
    <li><a href="about">About us</a></li>
    <li><a href="menu">Menu</a></li>
    <li><a href="contact">Contact</a></li>
  </ul>
</div>
<header>
  <a href="">
    <img src="images/wrapped_green_logo@2x.png" class="header-logo" alt="logo">
  </a>
  <nav>
    <ul class="header-links">
      <li><a href="about">About us</a></li>
      <li><a href="menu">Menu</a></li>
      <li><a href="contact">Contact</a></li>
    </ul>
    <div class="burger">
      <img src="images/icon-hamburger.svg" alt="hamburger-icon">
    </div>
  </nav>
</header>
<div class="hero">
  <div class="hero__container">
    <div class="left-col">
      <h1>Healthy & Fresh Food For You</h1>
      <p>Created for lover of healty, delicious and non-obvious food</p>
      <a href="" class="btn btn__gold">Check Menu<svg xmlns="http://www.w3.org/2000/svg" class="button__icon" viewBox="0 0 30 24" width="50" height="20"><path fill="none" d="M0 0h24v24H0z"/><path d="M16.172 11l-5.364-5.364 1.414-1.414L20 12l-7.778 7.778-1.414-1.414L16.172 13H4v-2z" fill="rgba(255,255,255,1)"/></svg> </a>
    </div>
    <div class="food-bg"></div>
  </div>
</div>

Answer 3

类似于 Karolaus Answer 但我更喜欢使用视图高度...我只是从 .hero__container 中删除了溢出并将以下样式（或添加@media）更改为原始代码...您可以看到有多少视图移动设备所需的高度（或您将其视为移动设备的宽度）...

.hero__container::after {
  content: '';
  position: absolute;
  width: 100vh;
  height: 100vh;
  z-index: 0;
  top: -20vh;
  right: -20vh;
/*   [![enter image description here][1]][1] */  
  background-color: #387546;
  background-position: -200vh -200vh;
  border-radius: 50%;
}
@media screen and (max-width: 420px){
  .hero__container::after{
  width:125vh;
  height:125vh;
  top: -50vh;
    right: -50vh;
  }
}
    

代码笔链接 ：https://codepen.io/vattevaii/pen/PobWZzX