.white_content {
position: absolute;
bottom: 50px;
left: 20px;
width: 200px;
height: 140px;
padding: 20px;
background-color: white;
z-index: 1002;
overflow: auto;
border-radius: 30px;
}

.white_content a {
text-decoration: none;
}

.go-top {
position: fixed;
bottom: 20px;
left: 20px;
}

.go-top a {
    display: block;
    text-decoration: none;
    color: #333;
    background-color: #f2f2f2;
    border: 1px solid #ccc;
    padding: 10px 20px;
    border-radius: 5px;
    letter-spacing: 2px;
}

#overlay {
    position: fixed;
    left: 0px;
    top: 0px;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
}