.spinner {
    /*border: 5px solid #ffad00;*/ /* Light grey */
    /*border-top: 5px solid #000000;*/ /* Blue */
    border-top: 5px solid blue;
    border-right: 5px solid green;
    border-bottom: 5px solid red;
    border-left: 5px solid pink;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    animation: spin 2s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}