.bg-uno{
    background: #159957;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #155799, #159957);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #155799, #159957); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */  
  }
    
.bg-dos{
    background: #12c2e9;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #f64f59, #c471ed, #12c2e9);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #f64f59, #c471ed, #12c2e9); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  }
  
.bg-tres{
    background: #4286f4;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #373B44, #4286f4);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #373B44, #4286f4); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  }
  
.bg-cuatro{
    background: #8A2387;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #F27121, #E94057, #8A2387);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #F27121, #E94057, #8A2387); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
  }
  
.bg-cinco{
  background-image: radial-gradient( circle farthest-corner at 12.3% 19.3%,  rgba(85,88,218,1) 0%, rgba(95,209,249,1) 100.2% );
}

.transparente{  
    background: rgba(0, 0, 0, 0.2);
  }

a:hover{
    text-decoration: none;  
  }