body{
    margin: 0; 
    overflow: hidden;
    width: 100%;
}

#guide{
    width:80%;
    border: solid black 3px;
    background:rgb(255, 255, 255, 0.5);
    display: none;
    position: fixed;
    bottom: 20%;
    left: 50%;
    transform: translate(-50%, -20%);
}


#btn{
    color: white;
    text-align: center;
    position: fixed;
    display:block;
    left: 45%;
    bottom: 5%;
    transform: translate(-5%, -50%);
    background: rgb(0, 0, 0, 0.2);
    border: solid white 2px;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: large;
}

#btn:hover{
    color: black;
    background: rgb(255, 255, 255, 0.8);
    border: black;
    transition: .4s;
}