.symposium-btn {
    position: relative;
    display: inline-block;
    overflow: hidden;
    padding: 14px 34px;
    border: 2px solid var(--sppb-primary);
    border-radius: 4px;
    color: var(--sppb-primary);
    background: transparent;
    font-weight: 600;
    text-decoration: none;
    transition: color .4s ease;
    z-index: 1;
}

.symposium-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--sppb-primary);
    transform: translateX(-100%);
    transition: transform .45s ease;
    z-index: -1;
}

.symposium-btn:hover::before {
    transform: translateX(0);
}

.symposium-btn:hover {
    color: #fff;
    text-decoration: none;
}