body {
    text-align: center;
    background: linear-gradient(to bottom, #6ab7f5, #fff);
    min-height: 100vh;
  }

  .coluna{
      width: 150px;
	  display: inline-block;
    /*
    float: left;
    width: 33.33%;
  .row::after {
    content: "";
    clear: both;
    display: table;
    */
  }