html,body{
    font-family: PingFangSC-Regular, sans-serif;
    width: 100%;
    padding: 0;
    margin: 0;
    
}
Element {

    -webkit-user-select: none;
   
    -moz-user-select: none;
   
    -khtml-user-select: none;
   
     user-select: none;
     -webkit-appearance: none;
   
   }
ul{
    list-style: none;
    padding: 0;
    margin: 0;
}
img{
    width: 100%;
    height: 100%;
}
.activi_header{
    text-align: center;
    background-color: #f3f3f3;
    color: #1f1f1f;
    font-size: 1.2rem;
    height: 50px;
    position: fixed;
    width: 100%;
    line-height: 50px;
    font-weight: bold;
    z-index: 111;
}
.activi_header img{
    width: 0.5rem;
    height: 1rem;
    position: absolute;
    left: 3%;
    top: 35%;
}