div.passwordstrength
{
    vertical-align:bottom;    
    display: inline-block;
    position:absolute;
    border:1px solid black;
    width:150px;
}

    div.passwordstrength div
    {
        float: left;   
        padding: 1px;
        display: table-cell;
       
    }

        div.passwordstrength div.valid
        {
            background-color: green;
        }

        div.passwordstrength div.medium
        {
            background-color: orange;
        }

        div.passwordstrength div.invalid
        {
            background-color: red;
        }