body {
    background-color: #000000;
    margin: 0;
    padding: 0;
    display: flex;
}
html, body {
    overflow: hidden;
}
/* サイドメニュー */
.menu {
    background-color: #4d4d4d;
    width: 260px;
    flex-shrink: 0;
}

.menu li {
    list-style: none;
    padding: 10px;
    margin-bottom: 30px;
}

.illust {
    display: flex;
    justify-content: space-between;
    align-content: flex-start;
    flex-wrap: wrap;
    padding-top: 10px;
    row-gap: 10px;
    margin:30px
}

.illust-img {
    width: 90px;
    height: 90px;
    object-fit: contain;
}

/* jjkバナー */
.jjk {
    margin: 10px 10px;
    display: block;
    margin-bottom: -20px;
}

/* 戻る */
.modoru {
    margin: 10px 10px;
    margin-bottom: 20px;
    display: block;
}


/* 右側全体 */
.main {
    position: relative;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: black;
  border-radius: 10px;
}
::-webkit-scrollbar-thumb {
  background: #333333;
  border-radius: 10px;
}


/* うねうねデザイン */
.frame {
    position: absolute;
    inset: 0;

    display: flex;
    flex-direction: column;
    justify-content: space-between;

    pointer-events: none;
}

.border img,
.border2 img {
    display: block;
}

.top-content {
    display: flex;
    width: 90%;
    height: 90%;
    justify-content: center;
    align-items: center;
}

#mainImage {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
}
* {
    box-sizing: border-box;
}