body {
    display: flex;
    flex-direction: column;
    font-family: serif;
    background-color: rgb(195, 204, 221);
    min-height: 100vh;
    margin: 0;
    max-width: 100%;
}

header, footer {
    width: 100%;
    color: #2d3343;
    background-color: rgb(255, 255, 255);
}

.center {
    max-width: 600px;
    margin: auto;
}

header {
    border-bottom: 4px solid #4c74af;
}

header h1 {
    font-size: 1.4em;
    font-weight: 800;
    margin: 1.8em 30px 0.5em;
}

footer {
    text-align: center;
    font-size: 0.8em;
    border-top: 2px solid #4c74af;
}

main {
    margin: 30px auto;
    flex: 1 0 auto;
    max-width: 600px;
}

section {
    background-color: rgb(255, 255, 255);
}

#intro-section {
    text-align: justify;
    border-top: 20px solid #4c74af;
    padding: 15px 50px;
    margin: 0 15px 4px;
}

#link-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 15px 50px 50px;
    margin: 0 15px;
}

#link-section h2 {
    color: #4c74af;
    border-bottom: 4px solid #4c74af;
}

#contact-section {
    padding: 15px 50px 35px;
    margin: 4px 15px 0;
}

#contact-section h3 {
    color: black;
    border-bottom: 1px solid black;
}

#contact-section a {
    font-family: sans-serif;
    color: #4c74af;
    text-decoration: none;
}

#contact-section a:hover {
    color: #234c70;
}

button {
    color: white;
    background-color: #4c74af;
    border: none;
    border-radius: 3px;
    min-width: 200px;
    padding: 10px 20px;
    margin: 0.5em;
    font-size: 16px;
    cursor: pointer;
    transition-duration: 0.4s;
}

#contact-btn {
    background-color: #428da1;
}

button:hover,
#contact-btn:hover {
    background-color: #234c70;
}