css - Bootstrapc3 : Overriding row left and right margins -

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trying override row class's default left , right margins 

.row .row {  margin-right: -15px;  margin-left: -15px; }

page has multiple rows like
html

<div class="row row-padded" id="question1"></div> <div class="row row-padded" id="question2"></div> <div class="row row-padded" id="question3"></div>

css

.row-padded {   margin-top:15px;   padding-left:25px;   padding-top:10px;   padding-bottom:10px; }

it works fine if overide id. works fine 1 row

#question1 {  margin-left:0px;  margin-right:0px; }

but not

div[id^='question'] {     margin-left:0px;     margin-right:0px; }

enter image description here

you need understand how specificity works. reason div[id^='question'] doesn't override .row .row because has 1 element , 1 attribute selector (considered same specificity class) while latter has 2 class selectors - classes override regular elements in specificity, makes sense 2 classes combined has more priority 1 class , 1 element. remember id overrides both class , element selectors.

if want second selector work, try:

div.row[id^='question'] {  margin-left: 0px;  margin-right: 0px; }

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