* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

body{margin:0;height:100vh;}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
}

button:focus {
  outline: 0;
}

a,
a:hover,
a:link {
  color: inherit;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-family: "roboto", "arial", "helvetica", "sans-serif", "pingfang tc", "pingfang sc", "Microsoft Yahei";
  font-size: 16px;
  line-height: 1.7;
}

body{
  height:100vh;
  display:flex;
  justify-content:center;
}

.security{
  text-align:center;
  position:absolute;
  top:50%;
  transform:translateY(-50%);
  left:0;
  width:100%;
}

.security .security-image{
  width: 600px;
  height: 600px;
  background: radial-gradient(closest-side, #fff 40%, #a8cdff66 40%, #fff);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin:0 auto;
}

.security .security-image img{
  width:130px;
}

.security .security-content{
  margin-top:-100px;
}

.security .security-content p{
  color:black;
  font-size: 36px;
  line-height: 50px;
  margin: 0;
}

.security .security-content span{
  font-size: 30px;
  line-height: 48px;
  display: block;
  color: #666666;
}

.security .security-content a{
  width: 400px;
  height: 80px;
  margin: 80px auto;
  font-size: 30px;
  color: white;
  background-color: #1678ff;
  padding: 0 10px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}

@media screen and (max-width: 1600px) {
  .security .security-image{
    margin-top:-120px;
  }
}

@media screen and (max-width: 768px) {
  .security .security-image{
    margin-top:0px;
  }
}

@media screen and (max-width: 600px) {
  .security .security-image{
    width:400px;
    height:400px;
  }

  .security .security-image img{
    width:100px;
  }

  .security .security-content{
    margin-top:-70px;
  }

  .security .security-content p{
    font-size:28px;
  }

  .security .security-content span{
    font-size: 21px;
    line-height: 30px;
  }

  .security .security-content a{
    font-size:21px;
    width: 300px;
    height: 60px;
  }

  .security .security-content a{
    margin:40px auto;
  }
}

@media screen and (max-width: 480px) {
  .security .security-image{
    width:320px;
    height:320px;
  }

  .security .security-image img{
    width:80px;
  }

  .security .security-content p{
    font-size:24px;
  }

  .security .security-content span{
    font-size: 18px;
    line-height: 30px;
  }

  .security .security-content a{
    font-size:21px;
    width: 300px;
    height: 60px;
  }

  .security .security-content a{
    margin:40px auto;
  }
}