style.css

body {
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: max-content auto;
  overflow: hidden;
}

#cnv-container {
  height: 100vh;
  display: flex;
  background-color: #666;
  overflow: auto;
}

#cnv {
  margin: auto;
  outline: 2px solid white;
  
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  image-rendering: -moz-crisp-edges;
}

#options {
  box-sizing: border-box;
  
  padding: 15px;
  background-color: white;
  font-family: Arial;

  display: grid;
  row-gap: 10px;
  column-gap: 10px;
  grid-template-columns: 75px 200px;
  grid-auto-rows: 22px;
  
  align-items: center;
  justify-items: right;
}

#options > * {
  width: 100%;
  margin: 0;
  box-sizing: border-box;
}

#options > div {
  display: flex;
  gap: 10px;
}
#options > div > * {
  width: 50%;
}