body {
                font-family: Arial, sans-serif;
                background-color: #f4f4f4;
                margin: 0;
                padding-top: 130px; /* space for the topnav height */
            }

            /* --- TOPNAV --- */
            .topnav {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 120px;
                background-color: #ffffff;
                z-index: 999;
                display: flex;
                align-items: flex-start; /* logo at the top */
                padding: 10px;
            }

            .topnav a {
                text-decoration: none;
            }

            .topnav-right {
                margin-left: auto; /* push help icon to the right */
                display: flex;
                align-items: flex-start;
            }

            /* --- PAGE CONTENT --- */
            .container {
                background-color: #fff;
                padding: 20px;
                box-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
                border-radius: 10px;
                width: 800px;
                max-width: 90%;
                margin: 0 auto;
            }

            h1 {
                text-align: center;
                font-size: 24px;
            }

            .canvas-container {
                display: grid;
                justify-content: center;
                margin-bottom: 20px;
                position: relative;
            }

            canvas {
                border: 2px solid #ccc;
                background-color: #fff;
            }

            .controls {
                display: flex;
                justify-content: space-between;
                margin-top: 20px;
            }

            .control-group {
                display: flex;
                gap: 15px;
            }

            .tools {
                display: flex;
                gap: 15px;
            }

            button, select, input[type="color"], input[type="file"] {
                padding: 8px 15px;
                font-size: 14px;
                cursor: pointer;
                border: none;
                border-radius: 5px;
                background-color: #4CAF50;
                color: white;
            }

            button:disabled {
                background-color: #ddd;
            }

            input[type="color"] {
                padding: 5px;
            }

            select {
                padding: 5px;
                font-size: 14px;
            }

            .tool-button {
                background-color: #007bff;
            }

            .active-tool {
                background-color: #0056b3;
            }

            .tool-buttons button {
                margin-bottom: 10px;
            }

            .zoom-controls {
                display: flex;
                gap: 10px;
                margin-top: 20px;
            }  

            #circleButton {
                display: none;
            }

            #rectButton {
                display: none;
            }

            #fillButton {
                display: none;
            }