*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding-bottom: 2em;
    font-family: 'Sen', sans-serif;
    font-size: 1.2rem;
    line-height: 1.6;
    color: #003B4A;
}

h1, h3 {
    font-weight: 900;
    line-height: 1;
}

h1 {
    font-size: 4rem;
    margin: 0;
}

h2 {
    margin: 0;
    text-transform: uppercase;
}

h3 {
    font-size: 2.5rem;
}

a {
    color: #F69333;
}

a:hover,
a:focus {
    color: rgb(96, 112, 116);
}

.sidebar a {
    color: rgb(96, 112, 116);
}

.sidebar a:hover {
    color: #F69333
}


header {
    width: 100%;
    background: #92DFF1;
    text-align: center;
    padding: 4em 0;
}

.intro {
    width: 100%;
}

.summary {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
    opacity: .8;
    font-size: .95rem;
    padding: 1em 0;
}

.preamble {
    margin: 0 auto;
    background: #efefef;
    padding: 3em 2em;
    margin-bottom: 4em;

    columns: 20em;
}

.preamble h3 {
    text-align: center;
    column-span: all;
}

.preamble p {
    margin-top: 0;
}

.main {
    padding: 2rem;
}

.sidebar {
    background: #92DFF1;
    padding: 2em;
}

@media (min-width: 900px) {
    .page-wrapper {
        display: flex;
        flex-wrap: wrap;
    }
    
    .main {
        width: 50%;
        margin-left: auto;
    }
    
    .sidebar {
        width: 30%;
        margin-right: auto;
    }
}