.card-header{
    cursor: pointer;
}
body{
    background-image: url(../img/diagonal-squares.png);
}
.container{
    background-color: #fff;
    border-left: 2px solid #ccc;
    border-right: 2px solid #ccc;
    height: 100vh;
    overflow-y: auto;
}
.back-to-top {
    cursor: pointer;
    position: fixed;
    bottom: 20px;
    right: 20px;
    display:none;
}
.disabled{
    cursor: not-allowed;
}
.hide{
    display:none;
}