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How to work OPERA?

Good morning,

Yesterday i've created this css to change background

@namespace url(;
@-moz-document domain("") {

body {
background-size: cover !important;
background-color: black !important;
background-position: center !important;
padding-top: 45px;
padding-bottom: 10px ;
background: url('') #000 no-repeat fixed !important;


It works on Firefox but not on Opera. Can someone explain me why?


  • use the import/export button
  • edited June 2018 Firefox

    Addon Stylish / Stylus / xStyle should rewrite style to understandable for Opera.

    And remove this line:

    @namespace url(;

    is unnecessary in the Opera and the latest Firefox.

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