@font-face {
  font-family: 'Font1';
  src: url('fonts/Merriweather-Black.ttf') format('truetype');
}

@font-face {
  font-family: 'Font2';
  src: url('fonts/Merriweather-Regular.ttf') format('truetype');
}

body {
  font-family: 'Font2', sans-serif;
  margin: 0;
  padding: 0;
}

.header_nav_ul{
    display: block;
}

.header_nav_ul{
    list-style: none;
    padding: 0px;
    margin: 0 auto;
}

.header_nav_ul li{
    padding: 15px;
    border-radius: 5px;
    float: left;
    overflow: auto;
    width: 155px;
    font-family: math;
}

.header_nav_ul li a{
    text-decoration: none;
    color: #333;
    transition: color 0.3s ease;
}


  .Register_button {
    height: 45px;
    width: 158px;
    font-size: 0.8em;
    color: white;
    background: #000000;
    border-radius: 3px;
    border: 1px solid #BA2829;
    cursor: pointer;
    font-family: 'Font2';
    margin-left: 15px;
  }

a:visited {
    color: #000; /* 改为你希望的已访问过链接的颜色 */
}

a {
    color:black;
    text-decoration: none;
}

a:hover {
    text-decoration:underline;
}