CodePen Embed - GROreOK

<button class="button">Nút 1</button>
<button class="button button2">Nút 2</button>
<button class="button button3">Nút 3</button>
<button class="button button4">Nút 4</button>
<button class="button button5">Nút 5</button>

.button {
  background-color: #4CAF50;
  border: none;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  margin: 4px 2px;
  cursor: pointer;
}

.button1 {font-size: 10px;}
.button2 {font-size: 12px;}
.button3 {font-size: 16px;}
.button4 {font-size: 20px;}
.button5 {font-size: 24px;}

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