body {
    min-height: 100%
}

html {
    height: 100%
}


/*这里规定了一级页面侧边栏宽度*/
.left__side {
    display: block;
    flex-wrap: nowrap;
    /*宽度在这里*/
    width: 12rem;
    overflow-x: auto;
    overflow-y: hidden;

}

.btn-toggle {
    display: inline-flex;
    align-items: center;
    padding: .25rem .5rem;
    font-weight: 600;
    color: #878787;
    background-color: transparent;
    border: 0
}

.btn-toggle::before {
    width: 1.25em;
    line-height: 0;
    content: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3e%3cpath fill='none' stroke='rgba%280,0,0,.5%29' stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M5 14l6-6-6-6'/%3e%3c/svg%3e");
    transition: transform .35s ease;
    transform-origin: .5em 50%
}
.btn-toggle:hover, .btn-toggle:focus {
    color: rgba(0,0,0,.85);
    background-color: rgba(225, 135, 172, 0.89);
}
.btn-toggle[aria-expanded="true"] {
    color: rgba(219, 20, 20, 0.85);
}

.btn-toggle[aria-expanded="true"]::before {
    transform: rotate(90deg)
}

.btn-toggle-nav a {
    color: #878787;
    display: inline-block;
    padding: .18rem .5rem;
    margin-top: .125rem;
    margin-left: 1.25rem;
    text-decoration: none;
}

.btn-toggle-nav a:hover, .btn-toggle-nav a:focus {
    color: rgba(0,0,0,.85);
    background-color: #ccefe5;
    box-shadow: none;
}

.btn-toggle-nav li {
    color: #878787;
    display: block;
    padding: .18rem .5rem;
    text-decoration: none;

}

.fw-semibold {
    font-weight: 600
}


.bd-placeholder-img {
    font-size: 1.125rem;
    text-anchor: middle;
    -webkit-user-select: none;
    -moz-user-select: none;
    user-select: none
}

@media (min-width: 768px) {
    .bd-placeholder-img-lg {
        font-size: 3.5rem
    }
}