local-server/html/ui/style.css

body {
    background: white;
}

button[disabled] {
    opacity: 0.5;
}

a[href], a[href]:visited, button.link {
    border: none;
    color: blue;
    background: none;
    cursor: pointer;
    text-decoration: none;
}

table {
    border-collapse: collapse;
}
th, td {
    border-left:   dotted 1pt;
    border-right:  dotted 1pt;
    border-bottom: dotted 1pt;
    padding: 2pt 4pt;
}
tr:first-child > th {
    border-top: dotted 1pt;
}
th, tr:last-child > td {
    border-bottom: solid 1pt;
}

.flat > * { margin-left: 1ex; }
.flat > *:first-child { margin-left: 0; }

.green { color: green; }
.red   { color: red; }

@media (prefers-color-scheme: dark) {
  body {
    background: black;
    color: orange;
  }
  button, input[type=submit] {
    background: #333;
    color: #eee;
  }
  a[href], a[href]:visited, button.link {
    border: none;
    color: #31b0fa;
  }

  .red { color: #c00; }
}

header {
    display: flex;
    align-items: center;
    border-bottom: 2pt solid;
    margin: 0 0 1em 0;
    padding: 1ex;
    justify-content: space-between;
}
#logo > img {
    vertical-align: middle;
}
header .utils > * {
    margin-left: 1ex;
}

.error {
    display: flex;
    position: relative;
    background: rgba(255,0,0,0.2);
    border: 1pt solid red;
    justify-content: space-between;
    align-items: center;
}
.error .btn-close,
.error .code {
    background: #600;
    color: white;
    font-weight: bold;
    border: none;
    align-self: stretch;
    padding: 1ex 1em;
}
.error .code {
    order: 1;

    display: flex;
    align-items: center;
    text-align: center;
}
.error .message {
    order: 2;
    padding: 1ex 2em;
}
.error .btn-close {
    order: 3;
}

.sheets {
    display: flex;
    align-items: stretch;
}
.sheets > div {
    margin: 0 1ex;
    border: 1pt solid;
    border-radius: 6pt;
}
.sheets .title {
    text-align: center;
    font-weight: bold;
    font-size: large;
    padding: 2pt 6pt;
    background: rgba(127,127,127,0.5);
}
.sheets .section {
    padding: 2pt 6pt 2pt 6pt;
    font-weight: bold;
    border-top: 1px dotted;
}
.sheets section {
    margin: 2pt 6pt 6pt 6pt;
}
.sheets > *:last-child > table:last-child > tr:last-child > td {
    border-bottom: none;
}

.notif {
    display: inline-block;
    position: relative;
}
.notif > div:first-child {
    position: absolute;
    min-width: 100%; height: 100%;
    background: white;
    opacity: 75%;
    text-align: center;
}

.links > * { margin-left: 1ex; }
.links > *:first-child { margin-left: 0; }

@media (prefers-color-scheme: dark) {
  .notif > div:first-child {
    background: black;
  }
}

.copy { font-size: small; }