JSFiddle - React, Tailwind, and code Playground

HTML

<div class="form-group outer">
<div class="col-xs-10 vcenter">
    <div class="span7 text-center">
        <form id="formid" method="get">
            <label for="platform" class="control-label">Enter Code, IMEI or Phone Number:</label><br />
            <input type="text" class="form-control" name="filtername" placeholder="Please Enter Code" />
            <input id="btngo" class="btn btn-success" value="GO" />
        </form>
        @using (Html.BeginForm("Index", "Home", FormMethod.Get))
        {
            <p>
                @Html.TextBox("filtername")
                <input type="submit" class="btn btn-success" value="GO" />
            </p>
        }
    </div>
</div>

CSS

.outer {
    display:table;height:300px;text-align:center;
}
.vcenter {display:table-cell;
    vertical-align:middle;
}