/* サイドメニュー */

ul.sidemenu {
    border-top: solid 2px pink;
    font-size: 0.85em;
    margin-top: 1rem;
    padding-left: 0;
    line-height: 0
}

ul.sidemenu li {
    list-style-type: none;
}

ul.sidemenu li a, .sidemenu details > summary{
    display: block;
    line-height: 30px;
    text-decoration: none;
    color: navy;
    background-color: transparent;
    border-top: none;
    border-left: none;
    border-right: none;
    border-bottom: solid 2px lightgreen;
    padding-left: 5px;
}

.sidemenu details > summary{
    list-style: none;
    outline: none;
    cursor: pointer;
    position: relative;
}

.sidemenu details > summary::-webkit-details-marker {
    display:none;
}

ul.sidemenu li a:hover, .sidemenu details > summary:hover{
    background-color: pink;
}

details summary::after{
    content: '';
    width: 0.6rem;
    height: 0.6rem;
    border: 0px;
    border-bottom: solid 2px navy;
    border-right: solid 2px navy;
    -ms-transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
    position: absolute;
    top: 50%;
    right: 5%;
    margin-top: -0.6rem;
}

details[open] summary::after {
    content: '';
    width: 0.6rem;
    height: 0.6rem;
    border: 0px;
    border-top: solid 2px navy;
    border-left: solid 2px navy;
    -ms-transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
    position: absolute;
    top: 50%;
    right: 5%;
    margin-top: -0.2rem;
}

.sidemenu details ul{
    padding-left: 1rem;
}

/* メニュー開閉時のアニメーション  --------------------------------*/
.sidemenu details[open] ul {
    animation: fadeIn 0.5s ease;
}
@keyframes fadeIn {
    0% {
        opacity: 0;
        transform: translateX(-10px);
    }
    100% {
        opacity: 1;
        transform: none;
    }
}
/* END メニュー開閉時のアニメーション  --------------------------------*/



.sidemenu details > ul > li > a{
    border-bottom: solid 2px skyblue;
}




/* 大阪大学ロゴ画像 */

.sidebar-feed {
    margin: 0 auto;
    width: 60%;
}

.sidebar-feed img {
    width: 100%;
}