改变input placeholder的字体样式

input::-webkit-input-placeholder { 
   /* WebKit browsers */   
 color: #331b07;
}
input:-moz-placeholder { 
   /* Mozilla Firefox 4 to 18 */
    color: #331b07;
}
input::-moz-placeholder {  
  /* Mozilla Firefox 19+ */ 
   color: #331b07;
}
input:-ms-input-placeholder {   
 /* Internet Explorer 10+ */  
  color: #331b07;
}