/* Set footer sticky at the bottom */
html,
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
body > footer {
    margin-top: auto;
}




.center-alert {
    position: fixed!important;
    left: 40%;
    top: 30%;
    z-index: 100;
}

#cover-spin {
    position:fixed;
    width:100%;
    left:0;right:0;top:0;bottom:0;
    background-color: rgba(255,255,255,0.7);
    z-index:1;
    display:none;
}

#loader {
    position: fixed;
    left: 50%;
    top: 50%;
    z-index: 2;
    width: 120px;
    height: 120px;
    margin: -76px 0 0 -76px;
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3498db;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

@-webkit-keyframes spin {
    0% { -webkit-transform: rotate(0deg); }
    100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}