.container {
            width: 100%;
            display: flex;
        }

        .highlighted-cell {
            border: 2px solid blue;
        }

        .limiting-reagent-border {
            border: 2px solid orange;
        }

        .main-content {
            width: 100%;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            /* Center horizontally */
        }

        .correct-answer {
            border: 2px solid green;
        }

        .incorrect-answer {
            border: 2px solid red;
        }

        .unbalanced-formula-input {
            border: 2px solid blue;
            width: 2ch;
        }

        .generate-reset-container {
            /* New container for buttons */
            display: flex;
            justify-content: center;
            /* Center horizontally */
            margin-bottom: 10px;
            /* Add some space below */
        }

        .generate-reset-container button {
            margin: 0 10px;
            /* Add space between buttons */
        }

        .guided-practice {
            width: 20%;
            padding: 20px;
            border-left: 1px solid #ccc;
        }

        body {
            background-color: lightgray;
        }

        .hidden {
            display: none;
        }

        .checkbox-button-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 100%;
        }

        .checkbox-button-container .row {
            margin-bottom: 10px;
            display: flex;
            justify-content: center;
            /* Center horizontally */
        }

        #guidedPracticeSection {
            position: fixed;
            /* Pop up on the right */
            top: 0;
            right: 0;
            width: 20%;
            height: 100%;
            background-color: white;
            padding: 20px;
            border-left: 1px solid #ccc;
            box-sizing: border-box;
        }

        #instructionsPopup,
        #periodicTableContainer {
            width: 80%;
            /* Match main content width */
            max-width: 800px;
            /* Optional max width */
            margin: 20px auto;
            /* Center horizontally */
        }