#left-up-title {
        font-size: 20px;
        color: #000;
        margin-left: 10px;
}

#top {
        background-color: #d3d3d3;
        position: absolute;
        top: 0px;
        left: 0px;
        width: 100%;
        height: 50px;
}

#menu {
        background-color: #f0f0f0;
        position: absolute;
        left: 0px;
        top: 50px;
        bottom: 0px;
        width: 200px;
        overflow-y: auto;
        scrollbar-width: none;
}

#menu::-webkit-scrollbar {
        display: none;
}

.menu-button {
        background-color: #f0f0f0;
        border-style: none;
        border-radius: 10px;
        width: 200px;
        height: 50px;
        color: #000;
        text-align: left;
        font-size: 18px;
        position: relative;
        cursor: pointer;
}

.menu-button:hover {
        box-shadow: inset 0 0 20px 15px rgba(0, 0, 0, 0.05);
}

.menu-note {
        font-size: 15px;
        color: #000;
        line-height: 1.4;
        position: relative;
        left: 26px;
        right: 16px;
        word-wrap: break-word;
        overflow-wrap: break-word;
}

.submenu {
        display: none;
        font-size: 15px;
        color: #000;
        line-height: 1.4;
        margin-left: 16px;
        margin-right: 16px;
        word-wrap: break-word;
        overflow-wrap: break-word;
}

#main {
        background-color: #fff;
        position: absolute;
        left: 200px;
        top: 50px;
        bottom: 0px;
        right: 0px;
        overflow-y: auto;
        scrollbar-width: none;
        transform: translateZ(0);
}

#main::-webkit-scrollbar {
        display: none;
}