html - Doubts related to the use of display: block CSS propery, my example don't work -


i finding problem using display: block.

if open example link can understand problem: http://onofri.org/example/example3/

the html code is:

<div id="container">       <div id="titlebox">         <p id="mytitle">promoting investment in agriculture</p>     </div>      <div id="columns">         <div id="first">             <p>bla bla bla</p>             <p>bla bla bla</p>             <p>bla bla bla</p>         </div>          <div id="second">             <p>bla bla bla</p>             <p>bla bla bla</p>             <p>bla bla bla</p>         </div>     </div>      <div id="reportbox">         <p>report</p>          <div id="flagscontainer">              <div id="reporteng"></div>             <div id="reportfrn"></div>             <div id="reportspn"></div>        </div>  </div> </div> 

and css code is:

#titlebox{     margin: 0 auto;     width: 350px;     background-color: #6da662;     height: 40px;     position:relative;     box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.28);     -moz-box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.28);     -webkit-box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.28); }  #mytitle{     /* consente di posizionare un elemento al centro del suo contenitore */     margin: 0 auto;     overflow: hidden;     color: #fff;     font-size: 16.5px;     font-weight: bold;     text-align: center;     vertical-align: middle;     line-height: 40px; }  #columns{     display: block; }  #reportbox{     margin: 0 auto;     margin-top: 25px;     width: 350px;     height: 150px;     background-color: #efefef;     border: 1px solid #dfdfdf;     font-family: verdana;     display: block; }   #reportbox p{     text-align: center;     font-size: 12px;     font-weight: bold;     color: #004673;     padding-top: 5%;  }  #flagscontainer{     width: 222px;     height: 200px;     min-height: 200px;     margin: 0 auto; } #reporteng{     float: left;     width: 64px;     background-image: url(united-kingdom2.png);      background-repeat: no-repeat;     margin-right: 10px;     height: 60%;        text-align: center; }  #reportfrn{     float: left;     /*width: 133px;*/     background-image: url(france2.png);      background-repeat: no-repeat;     width: 64px;     height: 60%;     text-align: center;     margin-right: 10px; }  #reportspn{     float: left;     /*width: 133px;*/     background-image: url(spain2.png);      background-repeat: no-repeat;     height: 60%;     width: 64px;     text-align: center; }     #first{     /*background-color: #8fbc8f;*/     /* sfumatura background: */     background-image: -ms-linear-gradient(top, #35f2ec 0%, #16b7d6 50%, #016d94 100%);     background-image: -moz-linear-gradient(top, #35f2ec 0%, #16b7d6 50%, #016d94 100%);     background-image: -o-linear-gradient(top, #35f2ec 0%, #16b7d6 50%, #016d94 100%);     background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0, #35f2ec), color-stop(0.5, #16b7d6), color-stop(1, #016d94));     background-image: -webkit-linear-gradient(top, #35f2ec 0%, #16b7d6 50%, #016d94 100%);     background-image: linear-gradient(to bottom, #35f2ec 0%, #16b7d6 50%, #016d94 100%);      width: 200px;     min-height: 300px;     border-radius: 10px;     float: left;     /*margin-right: 15px;*/     margin-bottom: 20px;     box-shadow: 6px 7px 15px rgba(0, 0, 0, 0.37);     -moz-box-shadow: 6px 7px 15px rgba(0, 0, 0, 0.37);     -webkit-box-shadow: 6px 7px 15px rgba(0, 0, 0, 0.37);  }  #second{     background-color: #8fbc8f;     width: 200px;     min-height: 300px;     border-radius: 10px;     float: right;     /*margin-left: 15px;*/     margin-bottom: 20px;     box-shadow: 6px 7px 15px rgba(0, 0, 0, 0.37);     -moz-box-shadow: 6px 7px 15px rgba(0, 0, 0, 0.37);     -webkit-box-shadow: 6px 7px 15px rgba(0, 0, 0, 0.37); } 

as can see, under #titlebox div, have container div named #columns contain 2 floated columns #first , #second

now want #reportbox div appears centered under #columns div , not (as now) between 2 columns.

trying optain behavior have try set display:block on #columns div , on #reportbox div don't work.

why? have show #reportbox under #columns div?

tnx

andrea

try

clear: both  

on #reportbox

reason being floated elements float in relation following elements. putting clear: both on element means want following element appear after of floating elements. has nothing display: block;. div display: block default (unless of course apply float)


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