body {
    margin: 0px;
    background: #e0f3ef;
    font-family: "Source Sans 3", sans-serif;
    padding: 50px 0px;
    color: #151515;
}

.center {
    width: 700px;
    margin: 0px auto;
}

header {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 40px;
    background-color: #9fc4bf;
    box-shadow: 0px 0px 10px rgb(0 0 0 / 0.3);
    display: flex;
    align-items: center;

    div {
        a {
            color: #151515;
            font-weight: bold;

            &:hover {
                color: rgb(23, 131, 104);
            }
        }
    }
}

h2 {
    margin: 70px 0px -20px 0px;
    border-bottom: 2px solid #151515;
}

h3 {
    margin: 40px 0px 0px 0px;
}

p {
    margin: 10px 0px;
}

h3::before {
    content: '';
    display: block;
    height: 70px;
    margin-top: -70px;
    visibility: hidden;
}

h3.selected {
    color: rgb(23, 131, 104);
    font-size: 32px;
}