* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-size: 16px;
    font-family: sans-serif;
    text-decoration: none;    
}

html {
    scroll-behavior: smooth;
}

.anchor {
    position: relative;
    visibility: hidden;
    top: -80px
}

h3 {
    font-weight: normal;
}

section:nth-child(2n) {
    background-color: #444;
}

section > h2 {
    padding: 25px;
    font-size: 2.7rem;
    font-weight: lighter;
    width: 100%;
    text-align: center;
}

section:nth-child(2n) > h2 {
    color: white;
}

.btn {
    cursor: pointer;
    padding: 7px 12px;
    border: 1px solid white;
    color: white;
    font-size: 1.3rem;
    background-color: rgba(0, 0, 0, 0);
    display: inline-block;
    transition: background-color 0.3s, color 0.3s;
}

.btn:hover {
    background-color: white;
    color: black;
}