.multi-button {
  display: flex;
  width: 100%;
  box-shadow: var(--shadow) 4px 4px;
}

.multi-button button {
  flex-grow: 1;
  cursor: pointer;
  position: relative;
  padding:
    calc(var(--space) / 1.125)
    var(--space)
    var(--space);
  border: var(--border-size) solid black;
  color: var(--color-secondary);
  background-color: var(--color-primary);
  font-size: 1.5rem;
  font-family: var(--font-family);
  text-transform: lowercase;
  text-shadow: var(--shadow) 2px 2px;
  transition: flex-grow var(--duration) var(--ease);
}

.multi-button button + button {
  border-left: var(--border-size) solid black;
  margin-left: calc(var(--border-size) * -1);
}

.multi-button button:hover,
.multi-button button:focus {
  flex-grow: 2;
  color: white;
  outline: none;
  text-shadow: none;
  background-color: var(--color-secondary);
}

.multi-button button:focus {
  outline: var(--border-size) dashed var(--color-primary);
  outline-offset: calc(var(--border-size) * -3);
}

.multi-button:hover button:focus:not(:hover) {
  flex-grow: 1;
  color: var(--color-secondary);
  background-color: var(--color-primary);
  outline-color: var(--color-tertiary);
}

.multi-button button:active {
  transform: translateY(var(--border-size));
}