#backToTop {
    display: none;
    position: fixed;
    bottom: 50px;
    right: 30px;
    z-index: 99;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: #555;
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 4px;
}

#backToTop:hover {
    background-color: #333;
}
footer {
    background-color: #A9A9A9;
    position: relative;
    padding: 20px;
    text-align: center;
    border-top: 3px solid #444;
}
.imgs {
    width: 250px;
}