body {
  font-family: sans-serif;
}

h1 {
  text-align: center;
}

.checkbox-container {
  display: grid;
  gap: 1em;
}

input[type="checkbox"] {
  position: absolute;
  pointer-events: none;
  opacity: 0;
}

input[type="checkbox"]:checked + label {
  background-color: lightgreen;
}

.checkbox-btn,
.new-workout-item {
  padding: .75em;
  border: 1px solid black;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.generate-btn {
  margin: 1em auto;
  display: block;
  padding: 1em 3em;
}

.new-workout-item {
  background-color: lightblue;
}