如何使顶部的背景像底部的 SVG 一样

我一直在这个网站上工作。我正在尝试使横幅背景像底部的 svg 图像一样。我不想使用图片作为背景，所以我一直在使用CSS背景图像。我正在使用剪辑路径，因为它可以更轻松地隐藏图片的一部分。

有什么方法可以让左下角半径与直线相交的点变圆，这样它就可以看起来像底部的 SVG 图像，请问？

header {
    position: relative;
    overflow: hidden;
    height: 800px;
    background-image: linear-gradient(315deg, #6c2aad 0%, rgb(44, 80, 199) 74%);
    clip-path: polygon(
        0 0,
        100% 0,
        100% calc(100% - 200px),
        0 100%
    );
    border-bottom-left-radius: 50% 50%;
}
.header-bg{
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
#banner-content {
    height: inherit;
    position: relative;
    display: flex;
    flex-direction: row;
    justify-content: center;
}
#banner-image-container img {
  position: absolute;
  left: 0;
  bottom: 50px;
}
#banner-image-container {
    align-self: flex-end;
    margin: 0 7%;
    height: 410px;
}
#right-side {
    align-self: center;
    margin: 0 7%;
    max-width: 420px;
    text-align: center;
    color: #FFF;
}
#right-side p:first-child {
    font-size: 30px;
    font-weight: bold;
}
@media screen and (min-width: 551px) {
    #right-side {
        align-self: center;
        margin: 0 7%;
    }
}
#banner-content img {
    max-width: 600px;
    width: 70%;
    display: block;
    margin: 0 auto;
}
@media screen and (max-width: 724px) {
    #banner-content {
        flex-direction: column-reverse;
        justify-content: flex-start;
    }
    #banner-image-container {
        align-self: center;
    }
}

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <header id="banner">
      <div class="header-bg"></div>
      <div id="banner-content">
          <div id="banner-image-container">
            <img src="http://webcomics.co/wp-content/uploads/sites/10/2010/09/James-mugshot.png" alt=""/>
          </div>
          <div id="right-side">
              <p>LOREM IPSUM</p>
              <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
          </div>
      </div>
    </header>
<div class="back">
  <svg width="1600px" height="612px" viewBox="0 0 1600 612" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
      <defs>
          <path d="M0,0.111104331 L1600,5.68434189e-14 L1600,344.091288 C1112.04518,489.644113 740.739648,576.663624 486.083401,605.14982 C376.998796,617.352174 281.625713,612.768489 207.849921,583.94285 C136.196666,555.946528 66.9133592,475.996007 0,344.091288 L0,0.111104331 Z" id="path-1"></path>
      </defs>
      <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
          <g id="Artboard">
              <mask id="mask-2" fill="white">
                  <use xlink:href="#path-1"></use>
              </mask>
              <use id="Mask" fill="#071246" fill-rule="nonzero" xlink:href="#path-1"></use>
          </g>
      </g>
  </svg>
  </body>
</html>

您可以使用伪元素和一些结合半径的旋转来近似它：

header {
  position: relative;
  overflow: hidden;
  height: 800px;
  z-index: 0;
}
header:before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  bottom: 0;
  left: 0;
  right: -200px;
  background-image: linear-gradient(315deg, #6c2aad 0%, rgb(44, 80, 199) 74%);
  border-bottom-left-radius: 35% 35%;
  transform: rotate(-18deg);
  transform-origin: left;
}
.header-bg {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
#banner-content {
  height: inherit;
  position: relative;
  display: flex;
  flex-direction: row;
  justify-content: center;
}
#banner-image-container img {
  position: absolute;
  left: 0;
  bottom: 50px;
}
#banner-image-container {
  align-self: flex-end;
  margin: 0 7%;
  height: 410px;
}
#right-side {
  align-self: center;
  margin: 0 7%;
  max-width: 420px;
  text-align: center;
  color: #FFF;
}
#right-side p:first-child {
  font-size: 30px;
  font-weight: bold;
}
@media screen and (min-width: 551px) {
  #right-side {
    align-self: center;
    margin: 0 7%;
  }
}
#banner-content img {
  max-width: 600px;
  width: 70%;
  display: block;
  margin: 0 auto;
}
@media screen and (max-width: 724px) {
  #banner-content {
    flex-direction: column-reverse;
    justify-content: flex-start;
  }
  #banner-image-container {
    align-self: center;
  }
}

<header id="banner">
  <div class="header-bg"></div>
  <div id="banner-content">
    <div id="banner-image-container">
      <img src="http://webcomics.co/wp-content/uploads/sites/10/2010/09/James-mugshot.png" alt="" />
    </div>
    <div id="right-side">
      <p>LOREM IPSUM</p>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.</p>
    </div>
  </div>
</header>
<div class="back">
  <svg width="1600px" height="612px" viewBox="0 0 1600 612" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
      <defs>
          <path d="M0,0.111104331 L1600,5.68434189e-14 L1600,344.091288 C1112.04518,489.644113 740.739648,576.663624 486.083401,605.14982 C376.998796,617.352174 281.625713,612.768489 207.849921,583.94285 C136.196666,555.946528 66.9133592,475.996007 0,344.091288 L0,0.111104331 Z" id="path-1"></path>
      </defs>
      <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
          <g id="Artboard">
              <mask id="mask-2" fill="white">
                  <use xlink:href="#path-1"></use>
              </mask>
              <use id="Mask" fill="#071246" fill-rule="nonzero" xlink:href="#path-1"></use>
          </g>
      </g>
  </svg>

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