"write style for ___" and paste that code

body{
    background:url("http://i.imgur.com/TQ2VsWy.png");
}

.header{
    background:#FFCC66;
}

.userlist{
    background:#FFCC66;
}

.pm-log{
    background:#FFCC66;
}

.pm-window h3{
    background:black;
    color:#FFcc99;
}

.pm-log-add{
    background:#FFCC66;
}

.button.cur{
    background:#FFCC66;
}

.maintabbarbottom{
    background:#FFCC66;
}

.teamlist{
    background:#FFCC66;
}

.pad{
    background:#FFCC66;
}

.team{
    background:black;
    color:#FFCC66;
}

.teamchart{
    background:#FFCC66;
}

.teamchart, .teamchart li{
    background:#FFCC66;
}

.battle-log{
    background:#FFCC66;
}

.ps-room{
    background:#FFCC66;
}

.ps-room.ps-room-opaque{
    background:#FFCC66;
}

.ps-room .battle-controls{
    background:#FFCC66;
}

.battle-log h2{
    background:black;
    color:#FFCC66;
}

.ps-room .battle-log-add{
    background:#FFCC66;
}

.rightbar, .leftbar{
    background:#FFCC66;
    color:black;
}

.ps-popup{
    background:#FFCC66;
}

 .backdrop:before{
    display: block;
    background: url("http://orig10.deviantart.net/5d2f/f/2014/293/4/5/pokemon_x_and_y_battle_background_electric_terrain_by_phoenixoflight92-d83l7ou.png");
    background-size: cover;
  }