.spinner-loading {
    width: 2rem;
    height: 2rem;
    border: 2px solid #f3f3f3; /* Light grey */
    border-top: 2px solid transparent; /* Blue */
    margin-right: .3rem;
    border-radius: 50%;
    animation: spinner-rotation 1s linear infinite;
    display: inline-block;
}

@keyframes spinner-rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}