full width div by small description text css responsive

i like to width: 100% for my text div. But i don't know why this not working.

So if i have small description text i have not full width by my list div and if i have long description text so i have 100% width div.

Here my screeny Problem:


Here my HTML:

<div class="columns events_list_even margin_padding_clean">
                            <div class="event_list_abstand">
                            <div class="two columns padding_right_left_clean">
                            <div class="date-list"><i class="fa fa-calendar fa-lg" style="margin-right: 10px"></i>Mo. 14.04.2014 </div>
                    <img src="http://www.davis-design.de/marktadresse/files/floh_troedel_jahrmarkt.png" class="category_icon">
                    <img src="http://www.davis-design.de/marktadresse/layout/images/veranstaltung_halbwegs_ueberdachung.png" class="roof">
                     <div class="ten columns margin_bottom_clean padding_right_left_clean">
                     <a href="/marktadresse/niedersachsen.html?veranstaltung=Abendmarkt+Osnabrueck%7E1X4JxCOwhDpD4Oj5ch%7E14.04.2014"><h2 class="date-ueberschrift" style="border-bottom: none;">Abendmarkt Osnabrueck</h2></a>
                     <div class="date-info"> Albrechtstraße 15 | 49076 Osnabrück |
                       Floh-, Trödel- &amp; Jahrmarkt</div>
                      <p class="margin_bottom_clean">Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam ...</p></div></div></div>


Add "width:100%" in your class(event_list_abstand).

Add this to your css

div.columns.events_list_even.margin_padding_clean {
width: 100%;

columns {
    -moz-box-sizing: border-box;
    width: 100%;

Make the above mentioned changes in the responsive.css at line number 5,to get the div with full width

According to your CSS, to target only the white and grey boxes, try:

.loop-posts .events_list_even{

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