style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@500&display=swap');

* {
  margin: 0;
  padding: 0;
  font-family: 'Poppins', sans-serif;
}

html, body {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: rgb(47, 54, 64);
  color: white;
}

body {
  height: auto;
  padding: 1rem;
  border-radius: 0.5em;
  background-color: #353B48;
  display: flex;
  flex-direction: column-reverse;
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.actions {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  justify-content: space-between;
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

#sliders {
  display: flex;
  justify-content: space-between;
}

#sliders div {
  display: flex;
}

#gridSize {
  margin-right: 1rem;
}

#buttons {
  margin-top: 1rem;
  display: flex;
  justify-content: space-between;
}

.button:last-child {
  margin-right: 0;
}

.input {
  height: 100%;
  display: flex;
}

.input > label {
  align-self: center;
  margin-right: 0.3rem;
}

.button {
  border-radius: 0.25rem;
  padding: 0.5rem;
  padding-left: 1rem;
  padding-right: 1rem;
  border: none;
  color: white;
  background-color: rgb(72, 126, 176);
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.05);
  transition: 0.3s;
  font-size: 1.2rem;
  width: 100%;
  margin-right: 1rem;
}

.button:hover {
  border-radius: 0.5rem;
  cursor: pointer;
  background-color: rgb(64, 115, 158);
}