html {
  font-family: sans-serif;
  font-size: 20px;
  color: #555;
  margin: 10px;
}

body {
  overflow-y: scroll;
}

h1 {
  font-size: 1.5rem;
  margin-top: 1em;
  padding-top: 0.5em;
  border-top: 1px solid #ccc;
  color: #555;
}

p {
  font-size: 1rem;
  text-align: justify;
  line-height: 1.7;
}

li {
  padding: 0.2em 0;
  line-height: 1.7;
}

a {
  text-decoration: none;
}

button,
select,
.button {
  height: 2em;
  font-size: 0.95em;
  border-style: solid;
  border: 1px solid #999;
  border-radius: 2px;
  padding: 0em 0.2em;
  margin: 0px;
  background: #ccc;
  color: #111;
  -webkit-appearance:none;
  -moz-appearance: none;
  appearance:none;
  text-align: center;
  line-height: 1.5em;
}

select {
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg fill='black' height='24' viewBox='0 0 24 24' width='24' xmlns='http://www.w3.org/2000/svg'><path d='M7 10l5 5 5-5z'/><path d='M0 0h24v24H0z' fill='none'/></svg>");
  background-repeat: no-repeat;
  background-position-x: 100%;
  background-position-y: 0.25em;
  padding-right: 20px;
}

table.board {
  border-collapse: collapse;
}

table.board,
table.keyboard {
  font-family: 'Varela Round';
  font-size: 24px;
  user-select: none;
  color: #333;
}

table.board,
table.board td {
  border: 1px solid #ddd;
}

table.board td {
  width:2em;
  height:2em;
  text-align:center;
  vertical-align:middle;
}

table.board td.row3,
table.board td.row6,
table.board td.row9 {
  border-bottom: 2px solid #ccc;
}

table.board td.row1 {
  border-top: 2px solid #ccc;
}

table.board td.col3,
table.board td.col6,
table.board td.col9 {
  border-right: 2px solid #ccc;
}

table.board td.col1 {
  border-left: 2px solid #ccc;
}

table.board td {
  color: #23a3ff;
}

table.board td.fixed {
  color: #333;
}

table.board td.bad {
  background: #fcc !important;
}

table.board td.selected {
  background: #bfe1ff !important;
}

table.board td.bad.selected {
  background: #ff9090 !important;
}

table.board td.glow {
  text-shadow: 0 0 0.2em;
}

table.board td.options {
  background: #eef;
  color: #aaa;
  font-size: 50%;
  word-wrap: break-all;
  overflow-wrap: break-all;
}

table.keyboard {
  border-collapse: collapse;
}

table.keyboard,
table.keyboard td {
  border: 1px solid #ddd;
}

table.keyboard td {
  text-align:center;
  vertical-align:middle;
  margin: 0;
  padding: 0;
  width: 2em;
  height: 2em;
  background: #ccc;
  white-space: nowrap;
}

table.keyboard td.buttons {
  background: #fff;
  border-color: #fff;
  text-align: left;
}

table.keyboard td.buttons button,
table.keyboard td.buttons select {
  height: 100%;
}

table.keyboard td.enabled {
  background: #bbb;
  box-shadow: inset 0px 0px 0.4em rgba(1,1,1,0.5);
}

table.keyboard td,
table.board td,
button {
  touch-action: manipulation;
}

table.keyboard.vertical td {
  width: 3em;
  height: 3em;
}

table.keyboard.horizontal {
  clear: both;
  border: 0px solid #ddd;
  border-collapse: separate;
  border-spacing: 0 1em;
}

table.keyboard.horizontal td {
  padding-left: 0.333px;
  padding-right: 0.333px;
}

table.keyboard.horizontal {
  margin-top: -1em;
}

table#board {
  float: left;
  margin-right: 10px;
}

h2 {
  font-size: 1.2em;
  font-weight: bold;
  padding: 0;
  margin: 1em 0 0.5em 0;
}

h3 {
  font-size: 1em;
  font-weight: bold;
  padding: 0;
  margin: 0.5em 0 0.25em 0;
}

.hint {
  max-width: 34em;
}

#center {
  max-width: 34em;
  margin: auto;
}

.hint p {
  font-style: oblique;
  margin: 0 0 0.5em 0;
}

.hint p br {
  margin-top: 0.5em;
  display: block;
  line-height: 1em;
  content: " ";
}

hr {
  margin-left: 0;
  margin-right: 0;
  border-top: 0;
  border-bottom: 1px solid #ccc;
}

p.vertical {
  white-space: nowrap;
}

.hidden {
  display: none;
}

@media only screen and (max-width: 680px) {
  html {
    font-size: 16px;
    margin: 2px;
  }
  table.board {
    font-size: 16px;
    float: none;
    margin-right: 0;
    margin-bottom: 10px;
  }
  table.keyboard {
    font-size: 16px;
  }
  .vertical {
    display: none;
  }
  .horizontal {
    display: block !important;
  }
  #center {
    max-width: initial;
    margin: 0;
  }
}

@media only screen and (max-width: 760px) {
  html {
    font-size: 20px;
    margin: 2px;
  }
  table.board {
    font-size: 22px;
    float: none;
    margin-right: 0;
    margin-bottom: 10px;
  }
  table.keyboard {
    font-size: 18px;
  }
  .vertical {
    display: none;
  }
  .horizontal {
    display: block !important;
  }
  #center {
    max-width: initial;
    margin: 0;
  }
}