.sidebar
{
    height: 100%;
    width: 24%;
    background-color: rgba(255, 255, 255, 0.5);
    float: left;
    border-radius: 0px 25px 25px 0px;
    transition: 0.75s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar *
{
    margin: 1rem;
}

.sidebar .item
{
    color: black;
    width: 75%;
    background-color: rgba(255, 255, 255, 0.5);
    border-radius: 25px;
    float: left;
    transition: 0.75s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar .item:hover
{
    width: 92%;
}