canvas.css

body {
  margin: 0 10px auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  font-family: 'Annie Use Your Telescope', sans-serif;
  height: 100vh;
}

div.game {
  width: 100%;
  display: flex;
  justify-content: center;
}

section#sidebar {
  border: 2px solid black;
  border-radius: 5px;
  width: 350px;
  margin-left: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}

canvas {
  border: 2px solid black;
  border-radius: 5px;
  background: white;
}

canvas#canvas {
  width: 900px;
  height: 600px;
}

h1 {
  padding-top: 20px;
  text-align: center;
  font-size: 70px;
  color: #e64f62;
  margin: 0;
  font-family: 'Cabin Sketch', sans-serif;
}

p {
  text-align: center;
  color: black;
  font-size: 20px;
  margin: 0;
  margin-bottom: 15px;
}

a {
  text-decoration: none;
  color: #79c199;
}

div.instructions {
  margin: 0 8px;
}

canvas#score {
  margin: 0 auto;
  width: 90%;
}

.modal {
  position: fixed;
}

.overlay {
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, .8);
  display: flex;
  justify-content: center;
  align-items: center;
}

.box {
  border: 2px solid black;
  border-radius: 5px;
  background: white;
  padding: 10px;
  width: 50%;
}

strong {
  font-family: 'Cabin Sketch', sans-serif;
  color: #e64f62;
  font-size: 40px;;
}

.hidden {
  display: none;
}

.pause {
  text-align: center;
  padding: 50px 0;
}

.tiny {
  font-size: 25px;
}

button {
  width: 100px;
  margin: 0 10px;
  font-family: 'Annie Use Your Telescope', sans-serif;
  font-size: 20px;
  font-weight: bold;
  text-transform: uppercase;
  color: white;
  background: #A3557D;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: rgba(163, 85, 125, 0.8);
}

.buttons {
  display: flex;
  justify-content: center;
}