* {
    margin: 0;
    padding: 0;
    font-family: YuGothic,'Yu Gothic','Hiragino Kaku Gothic ProN','ヒラギノ角ゴ ProN W3',sans-serif;
}
html {
    background-color: #F6F6F6;
    color: #464D48;
}
.contents img {
    width: 60px;
    margin: 20px;
}

.box p {
    text-align: center;
    margin-top: 20px;
    font-size: large;
    font-weight: bold;
}
details {
    margin: 0 auto;
    border: 1px solid #aaa;
    width: 80%;
    margin-top: 30px;
    user-select: none;
}
details .details-content-wrapper {
    padding: 1rem 1rem 1rem 2rem;
}
details .details-content {
    overflow: hidden;
}
details summary {
    display: block;
    cursor: pointer;
    position: relative;
    padding: 0.5rem 0.5rem 0.5rem 36px;
}  
details summary::-webkit-details-marker {
    display: none;
}
details summary::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: 10px;
    margin: auto 0;
    width: 10px;
    height: 10px;
    border-top: 3px solid #2151ca;
    border-right: 3px solid #ee8a19;
    transform: rotate(45deg);
}
details[open] summary {
    border-bottom: 1px solid #aaa;
}
details.inner {
    width: 95%;
    margin-top: 10px;
}
.details-content a {
    display: block;
    margin: 0 auto;
    width: 80%;
    text-align: center;
    text-decoration: none;
    color: #fff;
    background-color: rgb(88, 96, 127);
    border-radius: 10px;
    padding: 10px 30px;
    transition: .2s;
}
.details-content a:hover {
    background-color: rgb(123, 127, 142);
}
footer {
    background-color: #1F0880;
    width: 100%;
    line-height: 35px;
}
footer span {
    display: block;
    color: #fff;
    text-align: center;
    font-size: 15px;
}