:root {
    --header-height: 60px;
    --footer-height: 40px;
    --sidebar-width: 220px;
    --sidebar-collapsed: 60px;
    --sidebar-collapsed-600: 0px;
    --transition-speed: 0.3s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    height: 100%;
    font-family: Arial, sans-serif;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.main-content {
    display: flex;
    flex: 1;
    margin-top: var(--header-height);
    margin-bottom: var(--footer-height);
    transition: margin-left var(--transition-speed);
}



iframe {
    width: 100%;
    height: 100%;
    border: none;
}