style.css

html, body {
  height: 100%;
  width: 100%;
  background-color: #121212;
  font-family: sans-serif;
  align-items: center;
  text-align: center;
}
#buttons-container {
  justify-content: center;
}
#board-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-grow: 1;
  overflow: hidden;
}
#sendlink {
  border-radius: 0px 50px 50px 0px;
  font-size: small;
  margin-left: 0px;
  min-width: 75px;
}
#wordentry {
  border-radius: 50px 0px 0px 50px;
  font-size: small;
  margin-right: 0px;
  min-width: 75px;
}
#board {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  grid-gap: 5px;
  box-sizing: border-box;
}
.square{
  border: 2px solid deepskyblue;
  min-width: 60px;
  min-height: 60px;
  font-size: 50px;
  font-weight: bold;
  color:gainsboro;
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: uppercase;
}
#keyboard-container{
  height: 40%;
  max-width: 550px;
  margin: 0 auto;
  
}
.keyboard-row {
  display: flex;
  justify-content: center;
  width: 100%;
  margin: 0 auto 8px;
  touch-action: manipulation;
}
.keyboard-row button {
  font-family: inherit;
  font-weight: bold;
  border: 0;
  padding: 0;
  height: 58px;
  cursor: pointer;
  background-color: rgb(129, 131, 132);
  color: whitesmoke;
  flex-grow: 1;
  text-transform: uppercase;
  margin-right: 6px;
  border-radius: 4px;
  user-select: none;
}
.keyboard-row button.wide-button {
  flex-grow: 1.5;
}
.spacer-half {
  flex-grow: 0.5;
}
.spacer {
  min-height:10px;
}
@media (max-height: 600px) {
    .square {
      font-size: 1.1em;
      line-height: 1.1em;
      min-width: 45px;
      min-height: 45px;
    }
  .
}