body {
    font-family: 'Nunito Sans', sans-serif;
    background-color: #30D5C8;
    color: #ffffff;
    margin: 0;
}

#container {
    display: flex;
    width: 900px;
    margin-left: auto;
    margin-right: auto;
}

#header {
    width: 900px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    padding: 20px;
}

#footer {
    width: 900px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
    padding: 20px;
}

#sidebar {
    width: 220px;
    padding: 20px;
}

#content {
    width: 680px;
    padding: 20px;
}

#sidebar a {
    display: block;
    text-decoration: none;
    color: #30D5C8;
    background-color: #ffffff;
    margin-bottom: 10px;
    padding: 10px;
    border: 2px solid #ffffff;
    border-radius: 10px;
    font-weight: 700;
}

#sidebar a:hover {
    color: #ffffff;
    background-color: transparent;
}

.hero-section,
.info-section,
.contact-box,
.feature-box,
.principle {
    background-color: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 14px;
    padding: 16px 20px;
    margin-bottom: 20px;
}

#content h3,
#content h4,
#content h5 {
    margin-top: 0;
}

#content p,
#content li {
    line-height: 1.6;
}

#content ul {
    padding-left: 20px;
}