nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    width: 100%;
    position: relative;
    height: 100%;
    overflow: auto;
    text-align: left;
    font-size: medium;
}
nav .head {
    background-color:#ddd;
    display: block;
    color: #283f9a;
    padding: 12px 20px;
    text-decoration: none;
    border-bottom: 1px dotted #283f9a;
    transition: 0.2s;
}
nav li a {
    display: block;
    color: #283f9a;
    padding: 12px 20px;
    text-decoration: none;
    border-bottom: 1px dotted #283f9a;
    transition: 0.2s;
}


    nav li a:hover {
        background-color: #555;
        color: white;
    }

.collapsible {
    background-color: #cce1ff;
    color: #283f9a;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    margin: 0;
    font-family: Calibri;
}

    .active, .collapsible:hover {
        background-color: #2257a1;
        color: white;
        transition: 0.2s;
    }

    .collapsible:after {
        content: '\002B';
        color: #283f9a;
        font-weight: bold;
        float: right;
       
    }

    .collapsible:hover::after {
        color: white;
    }

.active:after {
    content: "\2212";
    color: white;
}

.content {
    padding: 3px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
    z-index: 0;
    width:100%;
}

    .content p {
        /*padding:10px;*/
        background-color: #bbb;
    }

.sub_content {
    background-color: #DDD;
    color: #283f9a;
    cursor: pointer;
    padding: 14px;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    font-weight: 600;
    margin: 10px 0px 10px 15px;
    font-family: Calibri;
    position:relative;
}

    .sub_content a {
        color: #283f9a;
        cursor: pointer;
        padding: 0;
        margin: 0;
        font-size: 16px;
        font-weight: 600;
        font-family: Calibri;
        text-decoration: none;
    }