gistfile1.txt

    -webkit-animation: writeText 0.5s ease; /* Safari 4+ */
    -moz-animation:    writeText 0.5s ease; /* Fx 5+ */
    -o-animation:      writeText 0.5s ease; /* Opera 12+ */
    animation:         writeText 0.5s ease; /* IE 10+ */
    
    &:nth-child(1) {
      -webkit-animation-duration: 0.5s;
    }
    &:nth-child(2) {
      -webkit-animation-duration: 1s;
    }   
    &:nth-child(3) {
      -webkit-animation-duration: 1.5s;
    }    
    &:nth-child(4) {
      -webkit-animation-duration: 2s;
    }