style.css

body {
  font-family: 'Roboto Mono', monospace;
  font-family: monospace;
}

header {
  font-size: 3em;
  font-weight: bold;
  color: gray;
}

#timer {
  font-size: 2em;
  font-weight: bold;
  color: gray;
}

.row {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-content: center;
}

.column {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.button {
  color: gray !important;
  background: #ffffff;
  margin: 3px;
  border: 2px solid gray !important;
  border-radius: 4px;
  display: inline-block;
  transition: all 0.3s ease 0s;
  font-family: 'Roboto Mono', monospace;
  font-family: monospace;
}

.button:hover {
  color: black !important;
  border-radius: 30px;
  border-color: gray !important;
  transition: all 0.3s ease 0s;
}

.up {
  /* no change */
}

.right {
  /* Safari */
  -webkit-transform: rotate(-90deg);
  /* Firefox */
  -moz-transform: rotate(-90deg);
  /* IE */
  -ms-transform: rotate(-90deg);
  /* Opera */
  -o-transform: rotate(-90deg);
  /* Internet Explorer */
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3);
}

.left {
  /* Safari */
  -webkit-transform: rotate(-270deg);
  /* Firefox */
  -moz-transform: rotate(-270deg);
  /* IE */
  -ms-transform: rotate(-270deg);
  /* Opera */
  -o-transform: rotate(-270deg);
  /* Internet Explorer */
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=1);
}

.down {
  /* Safari */
  -webkit-transform: rotate(-180deg);
  /* Firefox */
  -moz-transform: rotate(-180deg);
  /* IE */
  -ms-transform: rotate(-180deg);
  /* Opera */
  -o-transform: rotate(-180deg);
  /* Internet Explorer */
  filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=2);
}

.letter-container {
  border: 2px solid gray;
  -webkit-border-radius: 4px;
  -moz-border-radius: 4px;
  border-radius: 4px;
  height: 60px;
  width: 60px;
  margin: 3px;
  align-items: center;
  vertical-align: center;
}

.letter {
  font-size: 3em;
  text-align: center;
  vertical-align: center;
  margin-top: 6px;
}

.underline {
  text-decoration: underline;
}

.warning {
  color: black;
}

.hidden {
  display: none;
}

.white {
  color: white;
}

#container {
  margin: 0 auto;
}