.btn-loading-custom {
    position: relative;
}

.btn-loading-custom .btn-loading-icon {
    position: absolute;
    top: calc(50% - 8px);
    left: 8px;
    width: 16px;
    height: 16px;
    border: 4px solid #fff;
    border-left-color: #fbb130;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 100;
}