::-webkit-input-placeholder {
   color: $black;
   font-size: 15px;
}

:-moz-placeholder { /* Firefox 18- */
   color: $black;
   font-size: 15px;  
}

::-moz-placeholder {  /* Firefox 19+ */
    opacity: 1;
   color: $black;
   font-size: 15px;  
}

:-ms-input-placeholder {  
   color: $black;
   font-size: 15px;  
}
input[placeholder], [placeholder], *[placeholder] {
   color: $black;
   font-size: 15px;  
}