:root{
    box-sizing: border-box;
    --color-main:#718cc7;
    --color-help:#C5A4D6;

    --back-main-color:#fff;

    --text-color-main1:#000;
    --text-color-main2:#fff;
    --text-color-help:#e7e7e7;
  }
  * {
    position: relative;
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
  }
  
  ul,
  li,
  dl,
  dd,
  dt {
    list-style-type: none;
  }
  
  a {
    text-decoration: none;
    color: #1c1200;
  }
  
  img {
    width: 100%;
    height: auto;
    border: none;
  }
  
  body {
    font-size: 25px;
    line-height: initial;
    color: var(--text-color-main1);
    background: var(--back-main-color);
    overflow-x: hidden;
  }
  
  body>*{
    width: 100%;
  }
  
  .content{
    width: 70%;
    margin: 0 auto;
  }
  
  input,
  button {
    border: none;
    outline: none;
    background-color: none;
  }
  
  .article{
    text-indent: 2em;
  }
  
  .font_size_normal{
    font-size: 18px;
  }

  .font_size_big{
    font-size: 40px;
  }
  
  .font_size_small{
    font-size: 16px;
  }

  .title{
    padding: 20px 0;
  }

  .title h1{
    font-size: 58px;
    color: var(--text-color-help);
  }
  .title h2{
    font-size: 38px;
  }
  .ic-kf{
    background-color: var(--color-main);
    color: #fff;
    border-radius: 50px;
    padding: 4px 20px;
    display: flex;
    align-items: center;
    margin: auto;
    width: 180px;
    height: 50px;
    display: flex;
    justify-content: center;
    font-size: 18px;
  }
  .ic-kf img{
    max-width: 30px;
    margin: 0 4px;
  }
  .fixed-nav{
    position: fixed;
    z-index: 999;
    right: -92%;
    bottom: 10px;
    display: flex;
    flex-direction: column;
  }
  .fixed-nav .list{
    overflow: hidden;
    width: 65px;
    height: 65px;
    background-color: #629dd2;
    border-radius: 100%;
    box-shadow: 0 0 10px #629dd2;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 8px 0;
  }
  .fixed-nav .list img{
    width: 45px;height: 45px;
  }