/* Reset */

* {
    box-sizing: border-box;
}

/* Page */

body {
    margin: 0;
    background: #f6f8f7;
    color: #2b2b2b;
    font-family: Arial, Helvetica, sans-serif;
}

/* Container */

.container {
    width: 75%;
    max-width: 1024px;
    margin: 0 auto;
}

/* Header */

header {
    background: #d8ebe6;
    padding: 30px;
    text-align: center;
}

/* Navigation */

nav {
    display: flex;
    justify-content: center;
    gap: 20px;

    background: #6f9f9a;
    padding: 15px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 10px 18px;
}

nav a:hover {
    background: #4f7c77;
}

/* Three-column layout */

.content {
    display: flex;
    gap: 20px;

    margin: 25px 0;
}

.sidebar {
    flex: 1;

    background: white;

    padding: 20px;

    border: 1px solid #d5d5d5;
}

.main-content {
    flex: 2;

    background: white;

    padding: 20px;

    border: 1px solid #d5d5d5;
}

/* Images */

img {
    width: 100%;
    height: auto;

    border: 1px solid #d5d5d5;

    margin: 15px 0;
}

/* Headings */

h1,
h2 {
    margin-top: 0;
}

/* Footer */

footer {
    background: #d8ebe6;

    text-align: center;

    padding: 20px;

    margin-bottom: 20px;
}

/* Responsive */

@media (max-width: 768px) {

    .container {
        width: 95%;
    }

    .content {
        flex-direction: column;
    }

    nav {
        flex-direction: column;
        align-items: center;
    }

}