.spinner {
    display: inline-block;
    opacity: 0;
    width: 0;
    -webkit-transition: opacity 0.25s, width 0.25s;
    -moz-transition: opacity 0.25s, width 0.25s;
    -o-transition: opacity 0.25s, width 0.25s;
    transition: opacity 0.25s, width 0.25s;
}

.spinner-block {
    text-align: center;
}

.has-spinner.active {
    cursor: progress;
}

.has-spinner.active .spinner {
    opacity: 1;
    width: auto; /* This doesn't work, just fix for unknown width elements */
}

.has-spinner.btn-mini.active .spinner {
    width: 10px;
}

.has-spinner.btn-small.active .spinner {
    width: 13px;
}

.has-spinner.btn.active .spinner {
    width: 16px;
}

.has-spinner.btn-large.active .spinner {
    width: 19px;
}