body {
    background-color: #c9f1ff;
    font-family: Arial, sans-serif;
    line-height: 1.25;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    min-height: 100vh;
    margin: 0;
}

.page-border {
    border: 3px solid #133680;
    padding: 15px;
    margin: 20px;
    width: 800px;
    box-sizing: border-box;
    border-radius: 15px;
}

@media screen and (max-width: 775px) {
    .page-border {
        width: 90%;
        padding: 15px;
    }
}

img, video {
    max-width: 100%;
    height: auto;
    padding: 5px 5px 5px 5px;
}

h1.top {
    font-size: 45px;
    color: 204596;
}

p {
    font-size: 18px;
    color: 133680;
}

p.sub {
    font-size: 15px;
}

h2.section {
    color: 204596;
}

li {
    color: 133680
}

footer {
    display: block;
}

.double {
    border-style: double;
    border-width: 3px;
}

.section-buttons {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    flex-wrap: wrap;
}

.tab {
    padding: 10px 16px;
    border: 1px soild rgba(0,0,0,0.3);
    background: transparent;
    cursor: pointer;
    border-radius: 6px;
    font-size: 1rem;
}

.tab.active {
    background: rgba(0,0,0,0.1);
    font-weight: bold;
}

.content {
    display: none;
    margin-top: 10px;
}

.content.active {
    display: block;
}

.row {
    display: flex;
    flex-wrap: wrap;
    padding: 0 4px;
}

.column {
    flex: 50%;
    padding: 0 4px;
}

.column img {
    margin-top: 8px;
    vertical-align: middle;
}