click shield in css
use a mask/shield with highest z-index occupying the whole screen
.shield{
}
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css
Cascading Style Sheets is a markup language with
- basically all label:value pairs
- a large set of builtin properties, including colours/patterns, position styles, common functionalitis like scroll, image auto resize… Sometimes stuff that should be done with actually functions, but very common so css include them and browsers render them.
- a few syntax tweaks like classes/inheritance, class in css - class in html…