Change color vertical menu 2

Hi, I want to change the color of the vertical menu when I open it with a Collapse

<pre>.list-unstyled {
    padding-right: 0;
    list-style: none;
}

p {
    font-size: 1.1em;
    font-weight: 300;
    line-height: 1.7em;
    color: #999;
}

a,
a:hover,
a:focus {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s;
}

.navbar {
    padding: 15px 10px;
    background: #fff;
    border: none;
    border-radius: 0;
    margin-bottom: 40px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar-btn {
    box-shadow: none;
    outline: none !important;
    border: none;
}

.line {
    width: 100%;
    height: 1px;
    border-bottom: 1px dashed #ddd;
    margin: 40px 0;
}

i,
span {
    display: inline-block;
}

.wrapper {
    display: flex;
    align-items: stretch;
}

#sidebar {
    min-width: 175px;
    max-width: 175px;
    background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #646f7f), color-stop(100%, #4a5564));
    background-image: -moz-linear-gradient(#646f7f, #4a5564);
    background-image: -webkit-linear-gradient(#646f7f, #4a5564);
    background-image: linear-gradient(#646f7f, #4a5564);
    /*border-top: 1px solid #858d99;*/
    color: #fff;
    opacity: .95;
    transition: all 0.3s;
}

    #sidebar.active {
        min-width: 80px;
        max-width: 80px;
        text-align: center;
    }

        #sidebar.active .sidebar-header h3,
        #sidebar.active .CTAs {
            display: none;
        }

        #sidebar.active .sidebar-header strong {
            display: block;
        }

    #sidebar ul li a {
        text-align: right;
    }

    #sidebar.active ul li a {
        padding: 20px 10px;
        text-align: center;
        font-size: 0.55em;
    }

        #sidebar.active ul li a i {
            margin-right: 0;
            display: block;
            font-size: 1.8em;
            margin-bottom: 5px;
        }

    #sidebar.active ul ul a {
        padding: 10px !important;
    }

    #sidebar.active .dropdown-toggle::after {
        top: auto;
        bottom: 10px;
        left: 50%;
        -webkit-transform: translateX(50%);
        -ms-transform: translateX(50%);
        transform: translateX(50%);
    }

    #sidebar .sidebar-header {
        padding: 10px 5px 5px;
        background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #646f7f), color-stop(100%, #4a5564));
        background-image: -moz-linear-gradient(#646f7f, #4a5564);
        background-image: -webkit-linear-gradient(#646f7f, #4a5564);
        background-image: linear-gradient(#646f7f, #4a5564);
        /*border-top: 1px solid #858d99;*/
    }

        #sidebar .sidebar-header strong {
            display: none;
            font-size: 1.8em;
        }

    #sidebar ul.components {
        padding: 20px 0;
        /*border-bottom: 1px solid #47748b;*/
    }

    #sidebar ul li a {
        padding: 10px;
        font-size: .9em;
        display: block;
    }

        #sidebar ul li a:hover {
            color: #646f7f;
            background: #fff;
        }

        #sidebar ul li a i {
            margin-left: 10px;
        }

    #sidebar ul li.active > a,
    a[aria-expanded="true"] {
        color: #fff;
        background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #646f7f), color-stop(100%, #4a5564));
        background-image: -moz-linear-gradient(#646f7f, #4a5564);
        background-image: -webkit-linear-gradient(#646f7f, #4a5564);
        background-image: linear-gradient(#646f7f, #4a5564);
        /*border-top: 1px solid #858d99;*/
    }

a[data-toggle="collapse"] {
    position: relative;
}

/*.dropdown-toggle::after {
    display: block;
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
}*/

ul ul a {
    font-size: 0.6em !important;
    padding-right: 30px !important;
    background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #646f7f), color-stop(100%, #4a5564));
    background-image: -moz-linear-gradient(#646f7f, #4a5564);
    background-image: -webkit-linear-gradient(#646f7f, #4a5564);
    background-image: linear-gradient(#646f7f, #4a5564);
    /*border-top: 1px solid #858d99;*/
}

ul.CTAs {
    padding: 20px;
}

    ul.CTAs a {
        text-align: center;
        font-size: 0.9em !important;
        display: block;
        border-radius: 5px;
        margin-bottom: 5px;
    }

a.download {
    background: #fff;
    color: #646f7f;
}

a.article,
a.article:hover {
    background-image: -webkit-gradient(linear, 50% 0%, 50% 100%, color-stop(0%, #646f7f), color-stop(100%, #4a5564));
    background-image: -moz-linear-gradient(#646f7f, #4a5564);
    background-image: -webkit-linear-gradient(#646f7f, #4a5564);
    background-image: linear-gradient(#646f7f, #4a5564);
    /*border-top: 1px solid #858d99;*/
    color: #fff !important;
}

/* ---------------------------------------------------
    CONTENT STYLE
----------------------------------------------------- */
#content {
    width: 100%;
    min-height: 91vh;
    transition: all 0.3s;
}

/* ---------------------------------------------------
    MEDIAQUERIES
----------------------------------------------------- */
@media (max-width: 768px) {
    #sidebar {
        min-width: 80px;
        max-width: 80px;
        text-align: center;
        margin-right: -80px !important;
    }

    .dropdown-toggle::after {
        top: auto;
        bottom: 10px;
        left: 50%;
        -webkit-transform: translateX(50%);
        -ms-transform: translateX(50%);
        transform: translateX(50%);
    }

    #sidebar.active {
        margin-right: 0 !important;
    }

    #sidebar .sidebar-header h3,
    #sidebar .CTAs {
        display: none;
    }

    #sidebar .sidebar-header strong {
        display: block;
    }

    #sidebar ul li a {
        padding: 20px 10px;
    }

        #sidebar ul li a span {
            font-size: 0.85em;
        }

        #sidebar ul li a i {
            margin-left: 0;
            display: block;
        }

    #sidebar ul ul a {
        padding: 10px !important;
    }

    #sidebar ul li a i {
        font-size: 1.3em;
    }

    #sidebar {
        margin-right: 0;
    }

    #sidebarCollapse span {
        display: none;
    }
}

'use strict'
$(document).ready(function () {
    $('#sidebarCollapse').on('click', function () {
        $('#sidebar').toggleClass('active');
    });
});