.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background-color: white;
}

.main-nav ul {
    display: flex;
    list-style: none;
}
.main-nav a {
    color: #333;
    text-decoration: none;
    padding: 10px 15px;
}
.main-nav a:hover {
    color: #2196f3;
    background-color: none;
}
.search-container input {
    width: 200px;
    padding: 5px;
    border-radius: 6px;
    border: 1px solid #161616;
}
.content-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    max-width: 1200px;
    margin: 50px auto;
    padding: 0 20px;
}
.content-item {
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba (0, 0, 0, 0.1);
    border-left: 5px solid #007bff;
}
.content-item h3 {
    color: #1a1a1a;
    margin-top: 0;
}

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
    }
    .site-header {
        flex-direction:column;
        justify-content: center;
    }
    .main-nav ul {
        flex-direction: column;
        align-items: center;
    }
}