body {
    font-family: Verdana, sans-serif;
    padding: 2rem;
    line-height: 1.4;
    font-size: 9pt;
    overflow-wrap: break-word;
}

p {
    margin: 0 0 1em 0;
}

main {
    max-width: 30rem;
    margin: 0 auto;
}

h1 {
    font-weight: bold;
}

h2 {
    font-weight: normal;
    font-style: italic;
}

h1,
h2 {
    font-size: 100%;
    margin-bottom: 0;
}

.subtitle {
    color: #999;
}

input {
    width: 100%;
}

.hidden {
    display: none!important;
}

.invalid {
    border: 1px solid red;
}

.invalid:focus {
    outline-color: red;
}

.buttons {
    display: flex;
}

.forward-button {
    flex: 1;
    margin-right: 0.5rem;
    display: block;
    text-align: center;
    padding: 0.5rem;
    background: #eee;
    color: inherit;
    text-decoration: none;
    border-radius: .2em;

    /* "to left" / "to right" - affects initial color */
    background: linear-gradient(to left, #eee 50%, #c1c9d6 50%) right;
    background-size: 200%;
    transition: none;
    margin-bottom: 1em;
}

.forward-button.forwarding {
    background-position: left;
    transition: all 3s linear; /* transition time will be adjusted by js */
}

.forward-button:first-child {
    margin-left: 0;
}