I want to use :span="5" for computer
 <el-col :span="5" class="container">
and for mobile i want to use
 <el-col  class="container">
o how can i use sm, md, lg?
I want to use :span="5" for computer
 <el-col :span="5" class="container">
and for mobile i want to use
 <el-col  class="container">
o how can i use sm, md, lg?
 
    
    You could use media queries, and display or hide them depending on screen size.
<el-col :span="5" class="container hide-mobile">
<el-col  class="container show-mobile">
@media only screen and (max-width: 770px) {
    .show-mobile {
        display:block;
    }
    .hide-mobile {
        display:none;
    }
}
.hide-mobile {
    display:block;
}
.show-mobile {
    display:none;
}
This would display the first element as a block by default, setting it to none on mobile screen sizes.
The second element would be hidden by default, and show as a block on mobile.
 
    
    You can make more than on div and make certain divs visible or not for the sizes, look at :
Missing visible-** and hidden-** in Bootstrap v4
Or you can use jquery or javascrript to change items for different sizes but its easier using the above method.
