body {
    background-color: rgb(33, 33, 33);
    font-family: Verdana, sans-serif;
    overflow-x: hidden;
    margin: 0 !important;
    padding: 0 !important;
}
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background:#0000 ; 
  }
::-webkit-scrollbar-thumb {
    background:rgb(111, 111, 111);
    border-radius: 5px;
}
.topnav {
    overflow: hidden;
    background-color: rgba(0, 0, 0, 0);
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
}
.topnav a {
    float: left;
    display: block;
    color: #ffffff;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}
.topnav .icon {
    display: none;
    position: relative;
    right: 0 !important;
}
#top {
    transition: background-color 0.3s ease;
}
@media screen and (max-width: 600px) {
    .topnav a{display: none;}
    .topnav a.icon {
      float: right;
      display: block;
    }
} 
@media screen and (max-width: 600px) {
    .topnav.responsive {
        position: fixed;
        left: 0;
        top: 0;
        width: 100%;
        background-color: #333 !important;
        }
    .topnav.responsive .icon{
      position: absolute;
      top: 0;
      right: 0;
    }
    .topnav.responsive a {
      float: none;
      display: block;
      text-align: left;
    }
    .title.responsive{
        top: 96px;
    }
    #navabout {
        float: none;
    }
}
.topnav{
    z-index: 9999;
}
.title{
    text-align: center;
    color: #ffffff;
    font-size: 30px;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    width: 100%;
    padding-bottom: 50px;
    padding-top: 50px;
}
.introduce {
    position: absolute;
    left: 0;
    top: 250px;
    color: #ffffff; 
    text-align: center;
    width: 100%;
}
.introduce h2{
    padding-top: 30px;
    font-size: 30px;
}
.introduce p {
    font-size: 20px;
}
.introduce h3{
    padding-top: 60px;
    font-size: 30px;
}
.introduce2 {
    position: absolute;
    left: 0;
    top: 1050px;
    color: #ffffff; 
    text-align: center;
    width: 100%;
    padding-bottom: 50px;
}
.introduce2 h2{
    padding-top: 30px;
    font-size: 30px;
}
.introduce2 p {
    font-size: 15px;
}
button {
    background-color: rgb(0,195,255);
    color: rgb(0, 0, 0);
    padding: 10px;
    border-radius: 12px;
    border: none;
}