.loader_overlay {
    position: absolute;
    z-index: 50;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}

.lukehaas_vertical_bars .loader,
.lukehaas_vertical_bars .loader:before,
.lukehaas_vertical_bars .loader:after {
    background: #ffffff;
    -webkit-animation: load1 1s infinite ease-in-out;
    animation: load1 1s infinite ease-in-out;
    width: 1em;
    height: 4em;
}

    .lukehaas_vertical_bars .loader:before,
    .lukehaas_vertical_bars .loader:after {
        position: absolute;
        top: 0;
        content: '';
    }

    .lukehaas_vertical_bars .loader:before {
        left: -1.5em;
        -webkit-animation-delay: -0.32s;
        animation-delay: -0.32s;
    }

.lukehaas_vertical_bars .loader {
    text-indent: -9999em;
    margin: 88px auto;
    position: relative;
    font-size: 11px;
    -webkit-transform: translateZ(0);
    -ms-transform: translateZ(0);
    transform: translateZ(0);
    -webkit-animation-delay: -0.16s;
    animation-delay: -0.16s;
}

    .lukehaas_vertical_bars .loader:after {
        left: 1.5em;
    }

@-webkit-keyframes load1 {
    0%, 80%, 100% {
        box-shadow: 0 0 #ffffff;
        height: 4em;
    }

    40% {
        box-shadow: 0 -2em #ffffff;
        height: 5em;
    }
}

@keyframes load1 {
    0%, 80%, 100% {
        box-shadow: 0 0 #ffffff;
        height: 4em;
    }

    40% {
        box-shadow: 0 -2em #ffffff;
        height: 5em;
    }
}