#loader-wrapper .loader-section {
    position: fixed;
    top: 0;
    width: 50%;
    height: 100%;
    background: rgba(34,34,34, 0.7);
    z-index: 1000;
}

#loader-wrapper .loader-section.section-left {
    left: 0;
}

#loader-wrapper .loader-section.section-right {
    right: 0;
}

#loader {
    z-index: 1001; /* anything higher than z-index: 1000 of .loader-section */
    display: block;
    position: fixed;
    left: 50%;
    top: 50%;
    width: 150px;
    height: 150px;
    margin: -75px 0 0 -75px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #3498db;
    
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
}

#loader:before {
    content: "";
    position: fixed;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #e74c3c;
    
    -webkit-animation: spin 3s linear infinite;
    animation:spin 3s linear infinite;
}

#loader:after {
    content: "";
    position: fixed;
    top: 15px;
    left: 15px;
    right: 15px;
    bottom: 15px;
    border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: #f9c922;
    
    -webkit-animation: spin 1.5s linear infinite;
    animation: spin 1.5s linear infinite;
}

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

.loaded #loader-wrapper .loader-section.section-left {
    -webkit-transform: translateX(-100%);
    -ms-transform: translateX(-100%);
    transform: translateX(-100%);
}

.loaded #loader-wrapper .loader-section.section-right {
    -webkit-transform: translateX(100%);
    -ms-transform: translateX(100%);
    transform: translateX(100%);
}

.loader #loader {
    opacity: 0;
}

.loaded #loader-wrapper {
    visibility: hidden;
}