html {
  font-size: 14px;
}

@media () {
    
    /*    min-width: 100%*/
    /*min-width: 768px)*/
    html {
        font-size: 16px;
    }
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

.rojo {
    background-color: red;
    width: 100%;
    height: 7px;
}

.blanco {
    background-color: white;
    width: 100%;
    height: 7px;
}

.azul {
    background-color: blue;
    width: 100%;
    height: 7px;
}