.sidebar {
    height: 100%;
    width: 0;
    position: fixed;
    top: 0;
    left: 0;
    background-color:black;
    overflow-x: hidden;
    transition: 0.5s;
    padding-top: 60px;
}
.sidebar a {
    padding: 8px 8px 8px 32px;
    text-decoration: none;
    color: #CCF;
    display: block;
    transition: 0.3s;
}
.sidebar a:hover {
    color: #FFF;
}
/* 表示用のクラス */
.sidebar.open {
    width: 250px;
}