.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f5f5f5;
    z-index: 9999;
}

.spinner {
    margin: 10px auto;
    width: 50px;
    height: 40px;
    text-align: center;
    font-size: 10px;
}

.spinner > div {
    background-color: #618ebb;
    height: 100%;
    width: 6px;
    display: inline-block;

    -webkit-animation: sk-stretchdelay 1.2s infinite ease-in-out;
    animation: sk-stretchdelay 1.2s infinite ease-in-out;
}

.spinner .rect2 {
    -webkit-animation-delay: -1.1s;
    animation-delay: -1.1s;
}

.spinner .rect3 {
    -webkit-animation-delay: -1s;
    animation-delay: -1s;
}

.spinner .rect4 {
    -webkit-animation-delay: -0.9s;
    animation-delay: -0.9s;
}

.spinner .rect5 {
    -webkit-animation-delay: -0.8s;
    animation-delay: -0.8s;
}

@-webkit-keyframes sk-stretchdelay {
    0%,
    40%,
    100% {
        -webkit-transform: scaleY(0.4);
    }

    20% {
        -webkit-transform: scaleY(1);
    }
}

@keyframes sk-stretchdelay {
    0%,
    40%,
    100% {
        transform: scaleY(0.4);
        -webkit-transform: scaleY(0.4);
    }

    20% {
        transform: scaleY(1);
        -webkit-transform: scaleY(1);
    }
}