style.css

body {
    background-color: #fff;
    color: #000000;
    text-align: left;
    font-family: sans-serif;
    margin: 20px;
}

a, a:visited {
    color: #000000;
}

img {
    border: 0;
}

.warn {
    background-color: #f9f6e7;
    color: #000000;
    text-align: center;
    margin: 5px;
    border: 1px solid #d4bc4c;
    min-height: 7px;
}

.substrate {
    max-width: 710px;
    margin: auto;
    overflow: hidden;
    overflow-x: scroll;
    white-space: nowrap;
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.substrate::-webkit-scrollbar {
    display: none;
}

#themingElementsList {
    white-space: normal;
    display: inline-block;
    vertical-align: top;
    width: 400px;
    border: 1px solid black;
    overflow: auto;
    height: 400px;
}

#preview {
    white-space: normal;
    display: inline-block;
    border: 1px solid black;
    width: 300px;
    overflow: auto;
    height: 400px;
}

textarea {
    width: 100%;
    font-family: monospace;
}

input[type=button] {
    font-family: sans-serif;
}

.ioForm {
    text-align: left;
    max-width: 710px;
    margin: auto;
}

.colorInput {
    width: 80px;
    display: table-cell;
    font-family: monospace;
}

.themingElement {
    width: 100%;
    text-align: left;
    border-bottom: 1px;
    border-bottom-style: solid;
    padding: 5px 0 5px 0;
    display: table;
}

.themingElement span {
    font-size: small;
    background-color: white;
    padding-left: 5px;
    display: table-cell;
    width: 290px;
    vertical-align: middle;
}

.gridWrapper { /*ex gridWrapper*/
    display: grid;
    text-align: left;
}

.gridWrapper span {
    line-height: 30px;
}

.gridWrapper div {
    padding-left: 5px;
}

.halfDivButtons {
    display: inline-block;
    width: 49%;
    vertical-align: top;
}

.halfDivButtons div {
    margin-bottom: 5px;
}