/* for spinner */
.spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(255, 255, 255, 0.8);
    z-index: 9999;
}
@keyframes lds-roller {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.lds-roller {
    position: relative;
    display: inline-block;
    width: 64px;
    height: 64px;
}
.lds-roller div {
    animation: lds-roller 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
    transform-origin: 32px 32px;
}
.lds-roller div:after {
    content: " ";
    display: block;
    position: absolute;
    width: 6px;
    height: 6px;
    background: #00539f;
    border-radius: 50%;
    margin: -3px 0 0 -3px;
}
.lds-roller div:nth-child(1) { animation-delay: -0.036s; }
.lds-roller div:nth-child(2) { animation-delay: -0.072s; }
.lds-roller div:nth-child(3) { animation-delay: -0.108s; }
.lds-roller div:nth-child(4) { animation-delay: -0.144s; }
.lds-roller div:nth-child(5) { animation-delay: -0.18s; }
.lds-roller div:nth-child(6) { animation-delay: -0.216s; }
.lds-roller div:nth-child(7) { animation-delay: -0.252s; }
.lds-roller div:nth-child(8) { animation-delay: -0.288s; }
/* end of spinner */