.loader-wrapper {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display:flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.loader {
    display: inline-block;
    width: 30px;
    height: 30px;
    position: relative;
    border: 4px solid #Fff;
    animation: loader 2s infinite ease;
}

.loader-inner {
    vertical-align: top;
    display: inline-block;
    width: 100%;
    background-color: #fff;
    animation: loader-inner 2s infinite ease-in;
}

@keyframes loader {
    0% { transform: rotate(0deg);}
    25% { transform: rotate(180deg);}
    50% { transform: rotate(180deg);}
    75% { transform: rotate(360deg);}
    100% { transform: rotate(360deg);}
}

@keyframes loader-inner {
    0% { height: 0%;}
    25% { height: 0%;}
    50% { height: 100%;}
    75% { height: 100%;}
    100% { height: 0%;}
}

/*.loader {
    position: absolute;
    left: 50%;
    top: 50%;
    z-index: 1;
    width: 120px;
    height: 120px;
    margin: -76px 0 0 -76px;

    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid blue;
    border-right: 16px solid green;
    border-bottom: 16px solid red;
    border-left: 16px solid pink;

    -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); }
}*/