.willers__btn[disabled] {
    opacity: 0.5;
    background-color: dimgrey;
}

.willers__btn--loading {
    padding-right: 4rem;
}

.willers__btn--loading:after {
    content: "";
    position: absolute;
    border-radius: 100%;
    top: 0.7rem;
    right: 0.9rem;
    width: 1rem;
    height: 1rem;
    border: 5px solid rgba(255, 255, 255, 0.5);
    border-left-color: #fff;
    border-top-color: #fff;
    animation: spin .8s ease-in-out 0s infinite;
}

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

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