#box-loader {
    position: absolute;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: auto;
    width: 100%;
    height: 100%;
}

.pre {
    border: 12px solid #f3f3f3;
    border-radius: 50%;
    border-top: 12px solid #223dd6;
    width: 70px;
    height: 70px;
    animation: spin 1s linear infinite;
}
  
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}