http://preview.themeforest.net/item/materialize-material-design-admin-template/full_screen_preview/11446068?_ga=1.59576811.715707808.1486237340

<div id="loader-wrapper">
        <div id="loader"></div>        
        <div class="loader-section section-left"></div>
        <div class="loader-section section-right"></div>
    </div>
    
    
    <div id="loader-wrapper">
        <div id="loader"></div>        
        <div class="loader-section section-left"></div>
        <div class="loader-section section-right"></div>
    </div>
    
#loader-wrapper .loader-section.section-left {
    left: 0;
}




    
    #loader {
    display: block;
    position: relative;
    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;
    z-index: 1001;
}
    
#loader::before {
    content: "";
    position: absolute;
    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: absolute;
    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;
}

#loader-wrapper .loader-section {
    position: fixed;
    top: 0;
    width: 51%;
    height: 100%;
    background: #eceff1;
    z-index: 1000;
    -webkit-transform: translateX(0);
    -ms-transform: translateX(0);
    transform: translateX(0);

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

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