.page-header{
    position:relative;
}

#abilita-modifica{
  position: absolute;
  display: block;
  right: 0;
  top: 25%;  
}

.btn.disabled, 
.btn[disabled], 
fieldset[disabled] .btn{
    pointer-events: none;
}

.abs{
    position:absolute;
}

.top-rx{
    top: 15px;
    right:15px
}

.rx40{
    right:40px;
}

.rx50{
    right:50px;
}