:root {
    --txt: #222222;
    --bg: #F1F1F1;
    --bg2: #22222222;
    --lnk: #223377;
    --hov: #227733;
}

* {
    box-sizing: border-box;
}

html {
    font-size: 62.5%;
}

body {
    margin: 0;
    padding: 0;
    font-size: 1.6rem;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--txt);
    background: var(--bg);
}

body > * {
    width: 1200px;
    max-width: 100%;
    margin: 1rem auto;
}

h1, h2, h3 {
    margin: 0 0 1rem 0;
    padding: 1rem;
}

a, .btn, button {
    text-decoration: none;
    color: var(--lnk);
    cursor: pointer;
}

a:hover {
    color: var(--hov);
}

.logo {
    height: 64px;
}

body > header, body > footer, nav {
    display: flex;
}

body > footer {
    justify-content: center;
    margin: 5rem 0 0 0;
    padding: 2rem;
}

.menu {
    display: flex;
}

.menu a {
    display: block;
    padding: 1rem;
    background: var(--bg2);
}


form {
    margin: 2rem;
    display:flex;
    flex-direction: column;
}

form > div {
    display: flex;
    padding: 1rem;
}

label {
    width: 20rem;
}

input {
    border: 1px solid var(--lnk);
    background-color: var(--bg2);
    color: var(--lnk);
    padding: .5rem;
}

button, .btn {
    border: 1px solid var(--lnk);
    background-color: var(--bg2);
    color: var(--lnk);
    padding: 1rem 2rem;
    box-shadow: -1px 2px 10px 3px var(--bg2) inset;
    transition: all ease .6s;
}

button:hover, .btn:hover {
    color: var(--hov);
    box-shadow: none;
}