html, body {
    height: 100%;
}

body {
    display: flex;
    flex-direction: column;
    font-family: 'Verdana', sans-serif;
    background-color: #f4f4f9;
    margin: 0;
    padding: 0;
    color: #333;
    font-size: 16px;
}

#main-content-wrapper {
    flex-grow: 1;
}

#header, #footer {
    background-color: #34495e;
    color: white;
    padding: 15px 10px;
    text-align: center;
}

.nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.nav ul li {
    margin: 5px 5px;
}

.nav ul li a {
    color: #ecf0f1;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background-color 0.3s;
    min-width: 32px;
    text-align: center;
    display: inline-block;
}

.nav ul li a:hover {
    background-color: #2c3e50;
}

.content-wrapper {
    padding: 15px;
    margin: 10px;
    max-width: 600px;
    width: auto;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

@media (min-width: 640px) {
    .content-wrapper {
        margin: 20px auto;
        padding: 20px 30px;
    }
}

h2 {
    color: #e74c3c;
    border-bottom: 2px solid #e74c3c;
    padding-bottom: 5px;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.joke-text {
    line-height: 1.6;
    font-size: 1.1em;
    padding: 10px;
    border-left: 5px solid #bdc3c7;
}

@media (max-width: 400px) {
    #header h1 {
        font-size: 1.5em;
    }
}