.nav{
    width: 300px;
 }

.nav__link{
    color: #303440;
    display: block;
    padding: 15px 0;
    text-decoration: none;
}

.nav__link--inside{
    border-radius: 6px;
    padding-left: 20px;
}

.nav__link--inside:hover{
    background: red;
}

.list{
     width: 100%;
    height: 100px;
    display: flex;
    justify-content:baseline;
    flex-direction: column;
    border-radius: 0 16px 16px 0;
    background: #fff;
}

.list__item{
    list-style: none;
    width: 100%;
    text-align: center;
    overflow: hidden;
}

.list__item--click{
    cursor: pointer;
}

.list__button{
    display: flex;
    align-items: center;
    gap: 1em;
    width: 70%;
    margin: 0 auto;
}

.arrow .list__arrow{
    transform: rotate(90deg);
}

.list__arrow{
    margin-left: auto;
    transition: transform .3s;
}

.list__show{
    width: 80%;
    margin-left: auto;
    border-left: 2px solid #303440;
    list-style: none;
    transition: height .4s;
    height: 0;
}