.tab-area button::before{
    position: absolute;
    content: '';
    height: 2px;
    width: 0;
    left: 0;
    bottom: 0;
    background: var(--primary-1-600);
    z-index: 2;
}

.tab-area button:hover::before{
    width: 100%;
}
.tab-area button::after{
    position: absolute;
    content: '';
    height: 2px;
    width: 100%;
    left: 0;
    bottom: 0;
    background: #e6e8eb;
    z-index: 1;
}

.tab-area button:hover::before{
    width: 100%;
    transition: .6s linear;
}
.tab-area button.active::before{
    width: 100%;
    transition: 7s linear;
}

.tab__button.active span {
    border-width: 2px;
    border-color: var(--primary-1-600);
}
.tab__button.active{
    color: var(--primary-1-600);
}