Editing 404 NET牛人

<!DOCTYPE html>
<html>

<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta charset="utf-8" />
    <title>404</title>
</head>

<body>

    <svg width="380px" height="500px" viewBox="0 0 837 1045" version="1.1" xmlns="http://www.w3.org/2000/svg">
        <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd" sketch:type="MSPage">
            <path d="M353,9 L626.664028,170 L626.664028,487 L353,642 L79.3359724,487 L79.3359724,170 L353,9 Z"
                id="Polygon-1" stroke="#007FB2" stroke-width="6" sketch:type="MSShapeGroup"></path>
            <path d="M78.5,529 L147,569.186414 L147,648.311216 L78.5,687 L10,648.311216 L10,569.186414 L78.5,529 Z"
                id="Polygon-2" stroke="#EF4A5B" stroke-width="6" sketch:type="MSShapeGroup"></path>
            <path d="M773,186 L827,217.538705 L827,279.636651 L773,310 L719,279.636651 L719,217.538705 L773,186 Z"
                id="Polygon-3" stroke="#795D9C" stroke-width="6" sketch:type="MSShapeGroup"></path>
            <path d="M639,529 L773,607.846761 L773,763.091627 L639,839 L505,763.091627 L505,607.846761 L639,529 Z"
                id="Polygon-4" stroke="#F2773F" stroke-width="6" sketch:type="MSShapeGroup"></path>
            <path d="M281,801 L383,861.025276 L383,979.21169 L281,1037 L179,979.21169 L179,861.025276 L281,801 Z"
                id="Polygon-5" stroke="#36B455" stroke-width="6" sketch:type="MSShapeGroup"></path>
        </g>
    </svg>
    <div class="message-box">
        <h1>404</h1>
        <p>页面未找到</p>
        <div class="buttons-con">
            <div class="action-link-wrap">
                <a onclick="history.back(-1)" class="link-button link-back-button">返回</a>
                <a href="/" class="link-button">返回首页</a>
            </div>
        </div>
    </div>

</body>

</html>

body {
  background-color: #2F3242;
}
svg {
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -250px;
  margin-left: -400px;
}
.message-box {
  height: 200px;
  width: 380px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -100px;
  margin-left: 50px;
  color: #FFF;
  font-family: Roboto;
  font-weight: 300;
}
.message-box h1 {
  font-size: 60px;
  line-height: 46px;
  margin-bottom: 40px;
}
.buttons-con .action-link-wrap {
  margin-top: 40px;
}
.buttons-con .action-link-wrap a {
  background: #68c950;
  padding: 8px 25px;
  border-radius: 4px;
  color: #FFF;
  font-weight: bold;
  font-size: 14px;
  transition: all 0.3s linear;
  cursor: pointer;
  text-decoration: none;
  margin-right: 10px
}
.buttons-con .action-link-wrap a:hover {
  background: #5A5C6C;
  color: #fff;
}

#Polygon-1 , #Polygon-2 , #Polygon-3 , #Polygon-4 , #Polygon-4, #Polygon-5 {
  animation: float 1s infinite ease-in-out alternate;
}
#Polygon-2 {
  animation-delay: .2s; 
}
#Polygon-3 {
  animation-delay: .4s; 
}
#Polygon-4 {
  animation-delay: .6s; 
}
#Polygon-5 {
  animation-delay: .8s; 
}

@keyframes float {
	100% {
    transform: translateY(20px);
  }
}
@media (max-width: 450px) {
  svg {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -250px;
    margin-left: -190px;
  }
  .message-box {
    top: 50%;
    left: 50%;
    margin-top: -100px;
    margin-left: -190px;
    text-align: center;
  }
}