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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    display: flex;
}

#navbar {
    position: fixed;
    min-width: 290px;
    top: 0;
    left: 0;
    width: 300px;
    height: 100%;
    border-right: solid;
    border-color: rgba(0, 22, 22, 0.4);
    background-color: #f8f9fa;
    overflow-y: auto;
}

#navbar header {
    color: #2c3e50;
    margin: 10px;
    text-align: center;
    font-size: 1.8em;
    font-weight: bold;
    padding: 10px;
}

#navbar .nav-link {
    display: block;
    padding: 10px 30px;
    color: #4d4e53;
    text-decoration: none;
    cursor: pointer;
    border-top: 1px solid #ddd;
}

#navbar .nav-link:hover {
    background-color: #e9ecef;
    color: #2c3e50;
}

#main-doc {
    position: absolute;
    margin-left: 310px;
    padding: 20px;
    margin-bottom: 110px;
}

.main-section {
    margin-bottom: 40px;
}

.main-section header {
    font-size: 1.5em;
    color: #2c3e50;
    margin-bottom: 15px;
    font-weight: bold;
}

.main-section p {
    margin-bottom: 15px;
    text-align: justify;
}

.main-section ul {
    margin-bottom: 15px;
    padding-left: 40px;
}

.main-section li {
    margin-bottom: 10px;
}

code {
    display: block;
    white-space: pre-line;
    position: relative;
    word-break: normal;
    word-wrap: normal;
    line-height: 2;
    background-color: #f7f7f7;
    padding: 15px;
    margin: 10px 0;
    border-radius: 5px;
    font-family: 'Courier New', Courier, monospace;
    color: #333;
}

@media (max-width: 815px) {
    #navbar {
        position: absolute;
        top: 0;
        padding: 0;
        margin: 0;
        width: 100%;
        max-height: 275px;
        border: none;
        z-index: 1;
        border-bottom: 2px solid;
    }

    #main-doc {
        position: relative;
        margin-left: 0;
        margin-top: 270px;
    }
}

@media (max-width: 400px) {
    #main-doc {
        margin-left: -10px;
    }

    code {
        margin-left: -20px;
        width: 100%;
        padding: 15px;
        padding-left: 10px;
        padding-right: 45px;
        min-width: 233px;
    }
}