Droup down menu appending to the main menu in css.

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hi,

I am creating horizontal menu bar for using css. Its working fine without any droup down menu.
When I wrote css for dropdown menu, its appending to my main menu instead of coming down as dropdown menu.
Please any one help, What i am missing. plzz.
Below are my html

<div id="talltabs-maroon">
            <ul>
                <li class='@Html.IsActive("Home", "Index")'>
                    <a href=@Url.Action("Index", "Home")>
                        <span class="glyphicon glyphicon-random"></span>
                        @*
                        </p>
                    </a>
                    <ul class="dropdown-content" style="top:100px; left:0">
                        <li>
                            <a href=@Url.Action("Valve", "Report")>
                                ^__i class="ti-receipt">
                                <p>Valve Report</p>
                            </a>
                        </li>
                        <li>
                            <a href=@Url.Action("Valve", "Report")>
                                ^__i class="ti-file">
                                <p>Cylinder Report</p>
                            </a>
                        </li>
                    </ul>
                </li>
            </ul>
        </div>

below are the css for main menu

#talltabs-maroon {
    clear: left;
    float: left;
    padding: 0;
    border-top: 3px solid #CD324F;
    width: 100%;
    overflow: hidden;
    font-family: Georgia, serif;
    height: 90px;
    position: inherit;
}

    #talltabs-maroon ul {
        float: left;
        margin: 0;
        padding: 0;
        list-style: none;
        position: relative;
        left: 50%;
        text-align: center;
    }

        #talltabs-maroon ul li {
            display: block;
            float: left;
            list-style: none;
            margin: 0;
            padding: 0;
            position: relative;
            right: 50%;
        }

            #talltabs-maroon ul li a {
                display: block;
                float: left;
                margin: 0 3px 0 0;
                padding: 0px 10px 6px 10px;
                background: #CD324F;
                text-decoration: none;
                color: #fff;
            }

                #talltabs-maroon ul li a p:hover {
                    color: aqua;
                }

                #talltabs-maroon ul li a:hover {
                    padding: 20px 10px 6px 10px;
                    color: black
                }

            #talltabs-maroon ul li.active a,
            #talltabs-maroon ul li.active a:hover {
                padding: 25px 10px 6px 10px;
                border-width: 5px;
                border-color: aqua;
                color: aqua;
            }

What I have tried:

here is my droup down menu css

.dropbtn {
    list-style-type: none;
    color: white;
    padding: 14px;
    font-size: 14px;
    border: none;
    cursor: pointer;
}

.dropdown {
    position: relative;
    display: block;
}

.dropdown-content {
    list-style-type: none;
    display: none;
    position: absolute;
    right: 0;
    /*background-color: black;*/
    background-image: url('../../Images/black-olive.jpg'); /*dropdowm popup*/
    min-width: 160px;
    box-shadow: 0px 8px 16px 5px rgba(0,0,0,0.2);
    z-index: 1;
    padding-right: 2px;
    margin-right: 2px;
}

    .dropdown-content a {
        color: white;
        padding: 10px 14px;
        text-decoration: none;
        display: block;
    }

        .dropdown-content a:hover {
            /*background-color: gray;*/
            color: black;
        }

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn {
    /*background-color: #3e8e41;*/
}