Qual é minha questão:
Olá, queria retira esse efeito 3D http://brasileiros.forumais.com/

Endereço do meu fórum:
http://brasileiros.forumais.com

Versão do fórum:
PHPBB3

Boas!

Vá em teu CSS com o código abaixo:

Código:

.h3 {
text-shadow: none !important;
color: black !important;
}

<li> Coloque no inicio de teu CSS.

Até mais.

Código:

#page-header .navbar ul.navlinks {
border-bottom: 1px solid rgb(0, 118, 177);
}
#page-footer, div.navbar, div.navbar ul.linklist {
display: block !important;
}
.navbar {
background-color: transparent;
}
.linklist.navlinks {
border-color: rgb(76, 160, 206) rgb(21, 93, 152) rgb(21, 93, 152);
border-image: none;
border-radius: 0px 0px 6px 6px;
border-style: solid;
border-right: rgb(21, 93, 152);
border-width: 1px;
overflow: hidden;
background: none 0px 0px repeat scroll rgb(23, 117, 189);
}
.linklist.navlinks a:hover {
background: none 0px 0px repeat scroll rgb(21, 93, 152);
box-shadow: rgb(18, 75, 121) 0px 0px 4px inset;
outline: none medium;
padding: 5px 7px 6px;
}
.linklist.navlinks a {
color: rgb(255, 255, 255);
font-family: Verdana;
font-size: 11px;
padding: 3px 7px;
text-shadow: rgb(18, 75, 121) 1px 1px 0px;
}
.wysiwyg {
background-image: url(http://i49.servimg.com/u/f49/16/89/74/34/untitl57.png);
background-repeat: no-repeat;
background-position: bottom right;
}

#profile-advanced-details{background:url(http://i49.servimg.com/u/f49/16/89/74/34/untitl54.png) repeat-x scroll 0 1px #D8E9F6}

.post{
  background-color: #ebfae6;
  border: 1px dashed #6FBD0A;
  moz-border: 1px solid #7CBA2B;
  webkit-border: 1px solid #7CBA2B;
}

#left .module,.panel.introduction{background:#ebfae6 url(http://i49.servimg.com/u/f49/16/89/74/34/untitl53.png) no-repeat;
}

.module .h3 {
    margin-top: 2px;
    border-bottom: 1px solid #569f1d;
    height: 18px;
    bottom:1px!important;color:#ffffff;font-family:tahoma;font-size:10px;margin:5px;position:relative;text-shadow:1px 1px 5px #000000}
.module .row3 {
    background: #e6ebd8;
    padding: 3px;
    margin-top: 3px;
    }
.module {
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
border: 1px solid #80c427;
border-radius: 4px;
    margin: 3px 1px;
    }

.row {background-color:#F0F9FF;}

div#divlinhar{display: none !important;}

    #tabs a {
        background-color: #8BBFE6;
        border-radius: 4px 4px 0 0;
        -moz-border-radius: 4px 4px 0 0;
        -webkit-border-radius: 4px 4px 0 0;
        -o-border-radius: 4px 4px 0 0;
        margin: 0 1px;
    }

    #tabs a span {
        color: white;
    }

    #tabs a:hover {
        background-color: #59B9D3 !important;
    }

    #tabs a:hover span {
        color: white !important;
    }

    #tabs .activetab a {
        border-bottom: 0;
        background: url("http://2img.net/i/fa/optimisation_fdf/fr/bg_tabs_profil.png") repeat-x;
    }

    #tabs .activetab a span {
        color: white;
    }

    #tabs .activetab a span:hover {
        color: yellow;
    }

    #tabs a:hover {
        background-color: #CADCEB;
        background-position: 0 -70px;
    }

    #tabs a:hover span {
        background-position: 100% -70px;
        color: #FF8A00;
    }

    #tabs #new-message-link a {
      background: transparent !important;
    }

#chatbox {
background-image: url(http://i49.servimg.com/u/f49/16/89/74/34/untitl57.png);
background-repeat: no-repeat;
background-position: bottom right;
}

.feedburnerFeedBlock img {
display: none;
}
.feedburnerFeedBlock li {
padding: 3px;
min-height: 20px;
}
.feedburnerFeedBlock li a{
font-size: 1.2em;
font-family: Arial,Helvetica,sans-serif;
background: url(http://www.forumeiros.com/i/img/puce_fleche.png) 0% 50% no-repeat;
padding-left: 15px;
color: #0372BE;
}
.feedburnerFeedBlock li a:hover{
color: #FF8A00;
}
.feedburnerFeedBlock li p.date {
margin: -2px 0px;
font-size: 1.0em;
background: url(http://2img.net/i/fa/subsilver/icon_miniposted.gif) 0% 50% no-repeat;
padding-left: 15px;
}
.feedburnerFeedBlock li p.feedItemAuthor {
margin: -2px 0px;
font-size: 1.0em;
}
.feedburnerFeedBlock ul li div {
color: #666;
line-height: 100%;
text-align: justify;
}

a.button1:hover, a.button2:hover, button.button2:hover, input.button1:hover, input.button2:hover, #search-box input.button2:hover {
    background-position: 0 100%;
    border: 1px solid
    #00A5CD !important;
    box-shadow: 1px 1px 5px !important;
    color:
    #00A5CD !important;
    }
    a.button1:hover, a.button2:hover, button.button2:hover, input.button1:hover, input.button2:hover {
    background-position: 0 100%;
    border: 1px solid
    #FF8A00;
    color:
    #FF8A00;
    }
    #search-box input.button2, input.button1, input.button2, a.button2 {
    background-color:
    whiteSmoke;
    background-image: url('http://2img.net/i/fa/optimisation_fdf/fr/bg_buttons.png');
    background-repeat: repeat-x;
    border: 1px solid
    #C3E0F1;
    border-radius: 2px;
    color:
    #666 !important;
    cursor: pointer;
    font-size: 11px;
    font-weight: 700;
    height: 24px;
    line-height: 27px;
    margin: 5px 6px;
    padding: 0 8px !important;
    text-align: center;
    box-shadow: 1px 1px 1px;
    }
    a.button2, body:last-child a.button1, button.button2, input.button1, input.button2 {
    padding: 1px 0;
    }
    a.button1, a.button2, button.button2, input.button1, input.button2 {
    background-color:
    #ffffff;
    background-image: url(http://2img.net/i/fa/optimisation_fdf/fr/bg_wrap.png);
    background-position: top;
    background-repeat: repeat-x;
    color:
    black;
    font-family: Verdana,Arial,Helvetica,sans-serif;
    overflow: visible;
    padding: 2px 3px;
    width: auto!important;
    }
    a.button1, input.button1 {
    border: 1px solid
    #666;
    font-weight: 700;
    }
    button.button2, input.button1, input.button2 {
    font-size: 1em;
    }
    dd input, dd textarea {
    margin-right: 3px;
    }
    input {
    cursor: pointer;
    font-family: Verdana,Arial,Helvetica,sans-serif;
    font-size: 1em;
    font-weight: 400;
    padding: 0 3px;
    vertical-align: middle;
    }

#message-box textarea {
background-image: url(http://i49.servimg.com/u/f49/16/89/74/34/untitl57.png);
background-repeat: no-repeat;
background-position: bottom right;
}

.table-title, .table-title h2 {
      font-weight: bold;
      text-shadow: 1px 1px 5px #000;
    }

form#smilies_categ{display:none!important}

.search-box, #search-box {
        display: none;
        }

ul.navlinks {
border-bottom:0px solid #FFFFFF;
}

.vote {
-moz-border-radius-bottomleft:5px;
-moz-border-radius-bottomright:5px;
-moz-border-radius-topleft:5px;
-moz-border-radius-topright:5px;
background-color:#EAEAEA;
border:1px solid #D4D6D5;
padding:4px 1px;
text-align:center;
width:20px;
}


.vote .vote-button a[href$="plus"] {
-moz-background-clip:border;
-moz-background-inline-policy:continuous;
-moz-background-origin:padding;
background:transparent url(http://i26.servimg.com/u/f26/12/56/56/12/116.jpg) no-repeat scroll 0 0;
color:transparent;
display:block;
height:21px;
width:22px;
}

.vote .vote-button a[href$="minus"] {
background-image:url(http://i26.servimg.com/u/f26/12/56/56/12/212.jpg);
background-repeat:no-repeat;
color:transparent;
display:block;
height:21px;
width:22px;
}

form#quick_reply #textarea_content textarea#text_editor_textarea {
background-image: url(http://i49.servimg.com/u/f49/16/89/74/34/untitl57.png);
background-repeat: no-repeat;
background-position: bottom right;
}
.linklist.navlinks {
margin-top: -21px;
margin-left: -10px;
width: 1322px;
}

Não tem em minha CSS

Olá!

É para adicionar.

Até mais.

Obrigado!