style.css

body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 500px;
}
.tabs {
    border: 1px solid;
    padding: 10px;
}
.tabs__nav {
    display: flex;
    flex-direction: row;
    margin-bottom: 30px;
}

.tabs__nav-item {
    width: 200px;
    outline: 1px solid;
    text-align: center;
    padding: 10px 0;
    cursor: pointer;
}
.tabs__nav-item:hover{
    background-color: aquamarine;
}
.tab__nav-active {
    background-color: rgb(150, 89, 158);
}

.tabs__content-item {
    display: none;
}
.tab__content-active {
    display: block;
}

/* Анимация табов */
.faded {
    animation-name: faded;
    animation-duration: 1.5s;
}
@keyframes faded {
    from {
        opacity:    0.1;
    }
    to {
        opacity:    1;
    }
}