Modify the placeholder style (color, font size, etc.)

 Effect:

code: 

input:-moz-placeholder,   
textarea:-moz-placeholder {   
    color: red;   
}   
  
input:-ms-input-placeholder,   
textarea:-ms-input-placeholder {   
    color: red;   
}   
  
input::-webkit-input-placeholder,   
textarea::-webkit-input-placeholder {   
    color: red;   
}  

The modification method of the WeChat applet has been updated before