修改input 的 placeholder

input::-webkit-input-placeholder, textarea::-webkit-input-placeholder { 
color: #666!important; 
} 
input:-moz-placeholder, textarea:-moz-placeholder { 
color: #666!important; 
} 
input::-moz-placeholder, textarea::-moz-placeholder { 
color: #666!important; 
} 
input:-ms-input-placeholder, textarea:-ms-input-placeholder { 
color: #666!important; 
}