.card-deck .card {
    margin-bottom: auto;
}

.btn_collapsed {
    width: 100%;
    text-align: left;
    border: 0px solid;
    text-decoration: none;
    color: black;
}

.btn_collapsed:hover {
    text-decoration: none;
    border: 0px solid;
}

.img_request {
    display: block;
    margin-left: auto;
    margin-right: auto;
    width: 50%;
}

.bd-placeholder-img {
    font-size: 1.125rem;
    text-anchor: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

@media (min-width: 768px) {
    .bd-placeholder-img-lg {
        font-size: 3.5rem;
    }
    

}

.snowEffect {
position: fixed;
width: 100%;
height: 100%;
left: 0;
top: 0;
z-index: 99;
overflow: hidden;
pointer-events:none; /*Không có dòng này là ko click đc các phần tử khác*/
}
#snowcanvas{
position: fixed;
z-index: 0;
}