body {
    height: 100vh;
    overflow: hidden; /* OK */
    display: flex; 
    flex-direction: column;
}
.d-flex.h-100 {
    min-height: 0 !important;
    height: 90vh !important;
}


.sidebar-left {
    width: 240px;
    background: #f8f9fa;
    border-right: 1px solid #ddd;
}
.content-center {
    height: 100%;      /* significatif car le parent a une vraie height */
    overflow-y: auto;
    min-height: 0 !important;
    flex: 1 1 auto;
}
.sidebar-right {
    width: 500px;
    background: #f1f3f5;
    border-left: 1px solid #ddd;
    height: 100%;      /* significatif car le parent a une vraie height */
    overflow-y: auto;
    min-height: 0 !important;
}
.nav-item > a {
    padding: 10px 15px;
    display: block;
    color: #333;
    text-decoration: none;
}
.nav-item > a:hover, .nav-item > a.active {
    background: #e9ecef;
    font-weight: bold;
}
.pane-header {
    font-size: 1.1rem;
    font-weight: 600;
    padding: 10px 0;
}
.tab-pane-content {
    display: none;
}
.tab-pane-content.active {
    display: block;
}
.list-group-item {
    cursor: pointer;
}
.list-group-item.active {
    background-color: #0d6efd;
    border-color: #0d6efd;
    color: #fff;
}