html - Other divs moving when list appears as dropdown in navbar -


i'm bit new css please forgive me shortcomings side.

i working on website , have made navbar in have few divs.
of divs contain list kind of drops down when hover of them. problem makes div increase in width , makes other divs around move around.
have observed width increases width of lengthiest element in list.
have no idea causing , have tried playing position nothing seems work.
stop moving around of above divs doesn't weird.

html:

<body> <div  class="header" id="banner"></div> <div class="header" id="navbar">     <div class="nb_item">home</div>     <div class="nb_item">about         <ul id="abtus_menu">             <li>la martiniere college, lucknow</li>             <li>la martiniere model united nations</li>             <li>secretariat</li>         </ul>        </div>     <div class="nb_item">register         <ul id="rgstr_menu">             <li>individual</li>             <li>delegation</li>          </ul>     </div>     <div class="nb_item">committees         <ul id="comt_menu">             <li>committee 1</li>             <li>committee 2</li>             <li>committee 3</li>             <li>committee 4</li>             <li>committee 5</li>             <li>committee 6</li>         </ul>     </div>     <div class="nb_item">resources</div>     <div class="nb_item">events         <ul id="evnt_menu">             <li>keynote speakers</li>             <li>socials</li>         </ul>     </div>     <div class="nb_item">sponsors</div>     <div class="nb_item">contact us</div>

css:

.html {     background-color: #ffffff; }  body {     margin: 0;     padding:0; }  .header {     width: 80%;     margin:auto;     padding:0;     display:flex;    }  #banner {     height: 200px;     width: 80%;     background-color: #eeeeee; }  #navbar {      background-color: #70a5da;     height: 28px;    }  .menu {     list-style-type:none; }  .nb_item {     display:inline-block;     width:auto;     padding:0px 10px;     color:#ffffff;     margin:auto;     text-align:center;     line-height:28px; }  .nb_item:hover {     color: #dddddd;     cursor:pointer; }  #abtus_menu li {     list-style-type:none;     display:none;  } .nb_item:hover #abtus_menu li {     display:block;     color: #dddddd; }  #comt_menu li {     list-style-type:none;     display:none; }  .nb_item:hover #comt_menu li {     display:block; }    #rgstr_menu li {     list-style-type:none;     display:none; }  .nb_item:hover #rgstr_menu li {     display:block; }  #evnt_menu li {     list-style-type:none;     display:none; }  .nb_item:hover #evnt_menu li {     display:block; }   .menu li {     display:inline; }

here's jsfiddle : jsfiddle (zoom out 50% if there problems viewing)

it's because divs part of document flow, hence when displayed, pushes out. need use position absolute on them this:

.nb_item {position: relative} /* allows it's child absolute elements adhere parents position (.nb_item) */

and then:

.nb_item ul {position: absolute; top: 100%; left: 0} /* absolutely positions child (drop down menu) element it's taken out of document flow, hence not affecting positions of other elements */

hope helps!

edit: absolutely positioned elements should have width defined, otherwise take on width of widest non-breaking word. try this:

.nb_item ul {width: 200px; border: 1px solid #000} .nb_item ul li {text-align: left} .nb_item ul li {padding: 10px}

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