Bootstrap Grid System implicit behavior -
I'm a Bootstrap Grid System Newbie and by now, it has come to know that you can define a line so that one The fourth column is For such category, their amount is 12 (LG, SM or MD). In the following division, the second does not specify the width for the 'LG' category. However, in the browser it spreads out of 12 out of 12 columns. What's the rule here? & lt; Div class = & quot; Line & quot; & Gt; & lt; Div class = & quot; Col-sm-9 col-lg-6 text-danger & quot; & Gt; I am the main content. & lt; / Div & gt; & lt; Div class = & quot; Colonel-SAM-3 text-alert & quot; & Gt; I'm the main sidebar. & lt; / Div & gt; & Lt; Div class = & quot; Col-lg-3 visible gt; & Lt; / Div & gt; An old question revived here .. But, it is okay to cross 12 units in one line. This causes the column to be wrapped up, and it does. If 12 columns are placed in more than one line, then each group ...