artistyle.css

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

body {
    margin: 40px auto;
    max-width: 650px;
    line-height: 1.6;
    font-size: 18px;
    color: #444;
    padding: 0 10px;
}

h1, h2, h3 {
    line-height: 1.2
}

hr {
    display: block;
    height: 1px;
    border: 0;
    border-top: 1px solid #ccc;
    margin: 1em 0;
    padding: 0;
}

header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
}

header h1 {
    margin: 0;
}

.page-header {
    margin-bottom: 1.5em;
}

.page-header h1, .page-header h2, .page-header h3{
    margin: 0;
}

table {
    table-layout: fixed;
    border-collapse: collapse;
    width: 100%;
    margin: 1em 0;
}

td, th {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}

.even tr:nth-child(even) {
    background-color: #f5f5f5;
}

.double tr:nth-child(4n+0) {
    background-color: #f5f5f5;
}
.double tr:nth-child(4n+3) {
    background-color: #f5f5f5;
}

.double th:first-child {
    width: 50%;
}

.flash {
    margin: 1em 0;
    padding: 1em;
    background: #f6e7db;
    border: 1px solid #000000;
}

.errors {
    margin: 0.1em;
    padding: 0.1em 0.5em;
    background: #ffb3b3;
    border: 1px solid #000000;
    flex: 100%
}
ul.errors {
  list-style-type: none;
}

/* Top-down Form
Label    [Input]
-----Button-----
*/

form {
    display:flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
}

form label {
    flex-basis: 30%;
}

form input {
    flex-basis: 70%;
    margin: 0.4em 0;
    height: 2em;
}

form input[type=submit], form input[type=button] {
    flex-basis: 100%;
}

form .basis_auto {
    flex-basis: auto !important;
}

form textarea {
    height: 30em;
    flex-basis: 100%;
    margin-bottom:0.4em;
}

/* Inline Form
Label [Input] Button
*/
form.inline {
    flex-wrap: nowrap;
    align-content: stretch;
    align-items: center;
}

form.inline label, form.inline input {
    align-self: unset;
    flex: 1 1 auto;
    margin: 0 0.3em 1em;
}

form.inline label,
form.inline input[type=submit],
form.inline input[type=reset],
form.inline input[type=button] {
    flex: 0 1 auto;
}