CSS styles you need to pay attention to when printing on the web

Today I wrote a function that prints on the front end, and encountered a very pitiful problem. The set background color did not work when printing:
The css style that did not work:

.p_class2_1{       
color:white;       
float:left;       
background: #808080!important;  
width:80%;  
}    
.p_class3_1{     
color:white;     
float:left;     
background: #808080!important;  
width:100%;
}       
.p_class5_1{     
color:white;    
background: #808080!important;  
width:100%;
}

Result Nothing worked,

was later solved through various methods:
The following is the solution code:

.p_class2_1{       
color:white;       
float:left;      
 background: #808080!important;  
       filter:progid:DXImageTransform.Microsoft.gradient(startColorStr='#808080',EndColorStr='#808080');  
       width:80%;
       }
       .p_class3_1{     
       color:white;     
       float:left;    
       background: #808080!important;  
     filter:progid:DXImageTransform.Microsoft.gradient(startColorStr='#808080',EndColorStr='#808080');  
     width:100%;}
     .p_class5_1{     
     color:white;     
     background: #808080!important;  
     filter:progid:DXImageTransform.Microsoft.gradient(startColorStr='#808080',EndColorStr='#808080');  
     width:100%;}   

 @media print {  
        .p_class2_1 {-webkit-print-color-adjust: exact;}  
        .p_class3_1 {-webkit-print-color-adjust: exact;} 
        .p_class5_1 {-webkit-print-color-adjust: exact;} 
    }

The results are as follows:

I found the background color that was not displayed before, but it is now displayed!
The most important code is@media print { <br> .p_class2_1 {-webkit-print-color-adjust: exact;} <br> .p_class3_1 {-webkit-print-color-adjust: exact;} <br> .p_class5_1 {-webkit-print-color-adjust: exact;} <br> } @media print is to display the background color when printing. It is not displayed by default!

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