html,body{margin:0;padding:0;height:100%;box-sizing:border-box}.App{font-family:Arial,sans-serif}.App.dark-mode{background-color:#333;color:#ccc}.container{display:flex;justify-content:space-between;align-items:center;padding:20px}.left-nav button{background-color:#007bff;color:#fff;border:none;padding:10px 20px;cursor:pointer}.left-nav button:hover{background-color:#0056b3}.logo-header-container img{vertical-align:middle}.content{padding:20px;min-height:calc(100vh - 60px)}.theme-toggle{display:flex;align-items:center}.theme-toggle button{background-color:#007bff;color:#fff;border:none;padding:10px 20px;cursor:pointer}.theme-toggle button:hover{background-color:#0056b3}