section {
    width: 200px;
    height: 200px;
    margin: 50px;
}

#overlay {
    pointer-events: all;
    z-index: 99999;
    border: none;
    margin: 0px;
    padding: 0px;
    width: 100%;
    height: 100%;
    top: 0px;
    left: 0px;
    position: fixed;
    background-color: rgba(0, 0, 0, 0.6);
}

    #overlay i {
        display: table-cell;
        vertical-align: middle;
        text-align: center;
    }

.spin-big {
    font-size: 50px;
    height: 50px;
    width: 50px;
}

.spin-normal {
    font-size: 35px;
    height: 35px;
    width: 35px;
}

.spin-small {
    font-size: 20px;
    height: 20px;
    width: 20px;
}

.spinner {
    position: absolute;
    left: 50%;
    top: 50%;
    height: 60px;
    width: 60px;
    margin: 0px auto;
    -webkit-animation: rotation .6s infinite linear;
    -moz-animation: rotation .6s infinite linear;
    -o-animation: rotation .6s infinite linear;
    animation: rotation .6s infinite linear;
    border-left: 6px solid rgba(0,174,239,.15);
    border-right: 6px solid rgba(0,174,239,.15);
    border-bottom: 6px solid rgba(0,174,239,.15);
    border-top: 6px solid rgba(0,174,239,.8);
    border-radius: 100%;
}

.loading {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 5px solid #ddd;
    border-top-color: dodgerblue;
    animation: loading 1s linear infinite;
    margin-left:50%;
    margin-top:10%;
}

@keyframes loading {
    to {
        transform: rotate(360deg);
    }
}