body{
    background-color: black;
    color: white;
}

.borda{/*para testes*/
    border: 1px solid red;
}

.btn-size-100 {
    width: 100px; }
  
  .btn-size-150 {
    width: 150px; }
  
  .btn-size-200 {
    width: 200px; }
  
  .btn-size-250 {
    width: 250px; }
  
  .btn-size-300 {
    width: 300px; }