sentq's post in Personalizar fundo padrão was marked as the answer
add the following CSS code to your style.css file
#whmcsthemes {
padding-top: 15px;
}
#whmcsthemes .navbar .navbar-inner {
padding: 0 29px;
-webkit-border-radius: 6px 6px 0 0;
-moz-border-radius: 6px 6px 0 0;
-o-border-radius: 6px 6px 0 0;
border-radius: 6px 6px 0 0;
}
#whmcsthemes .whmcscontainer {
box-shadow: none;
-webkit-border-radius: 0 0 4px 4px;
-moz-border-radius: 0 0 4px 4px;
-o-border-radius: 0 0 4px 4px;
border-radius: 0 0 4px 4px;
}
#whmcsthemes .navbar .navbar-inner .container {
background: transparent;
}
.contentcon {
background: #f3f3f3;
background: -moz-linear-gradient(top, rgba(170,212,225,1) 0%, rgba(255,255,255,0) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(170,212,225,1)), color-stop(100%,rgba(255,255,255,0))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(170,212,225,1) 0%,rgba(255,255,255,0) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(170,212,225,1) 0%,rgba(255,255,255,0) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(170,212,225,1) 0%,rgba(255,255,255,0) 100%); /* IE10+ */
background: linear-gradient(to bottom, rgba(170,212,225,1) 0%,rgba(255,255,255,0) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#aad4e1', endColorstr='#00ffffff',GradientType=0 ); /* IE6-9 */
}
sentq's post in Personalizar fundo padrão was marked as the answer