ColdP_server/static/css/theme2.css

body{
    background:#EEF5F9;
}
.container{
    background:#41a6ff;
}
.left-nav{
    background:#fff;
}

.left-nav a{
    color:#686a76;
}
.left-nav a.active{
    background: #786AED !important;
    color: #fff;
}
.left-nav a:hover{
    background: #786AED !important;
    color: #fff;
}