css - Understanding positioning: adding position absolute to img container, doesn't allow me to margin auto. Why? -

-

i trying understand positioning , when parent element positioned relatively can position children element absolutely. @ least thought understood this.

i proceeded give picture element below position:absolute, when did ran problem couldn't center image in mobile view (using media query). tried test centering normally, still couldn't make image center. used margin-left: auto , margin-right:auto under .img-circle, didn't work.

so removed position:absolute on .picture class , boom worked. 1 way or another, had re-position title class.

it looks understanding of positioning bit off, please me understand why above happened exactly? have done avoid such mess, because took me while it. thank you!

codepen project

/*.picture{    position:absolute;      }*/    .img-circle{    margin-top:10em;    width:20em;    height:20em;    border:.2em solid;    border-radius:50%;    display:block;   }/*image shape*/
<div class="container container-fluid contthird1">                <div class="picture">                 <img class="img-circle img-responsive" src="http://a5.files.biography.com/image/upload/c_fill,cs_srgb,dpr_1.0,g_face,h_300,q_80,w_300/mte5ntu2mze2njuyotk2mta3.jpg" class="art">                </div>                <!--end of picture-->                    <h3 id="flip">click slide panel right</h3>                          <div class="title">                <p class="lead">i'm <a class="link" target='_blank' href='http://www.freecodecamp.com/map'>self taught</a> web designer, developer, co-founder , entrepreneur based in finland.                  <br> i'm part of small web development                  <br> team in upcoming start-up, building web ,                  <br> mobile applications.                  <br>my passion use technology based                  <br> solutions, solve real world challenges.                  <br> competences:                  <br> languages , frameworks:                  <br> javascript, html5, css3, jquery, bootstrap3,                  <br> angular.js, meteor.js.                  <br> tools & expertise:                  <br> git, responsive web design, agile                  <br> methodologies.</p>                </div>                </div>              <!--end of container-->

margins works fine relative/static elements. use of margins absolute/fixed element makes no sense since margins works betweeen elements in same document flow. when put position absolute going out of normal flow of document. need solution center that. example of simple global perfect center without pre-knowing sizes of elements:

 .img-circle {      position: absolute;      left: 50%;      -webkit-transform: translatex(-50%); /* ios devices*/      transform: translatex(-50%);  }

see working:

http://codepen.io/anon/pen/nnplgw


Comments

Post a Comment

Popular posts from this blog

gridview - Yii2 DataPorivider $totalSum for a column -

-
i have order , ordersearch models. in order list (actionindex) gridview there filtering , sorting. on of columns in order order_total (sum of products in order). i need implement sum of order_total in gridview. if manually counting activedataprovider->getmodels() array_map spend 3 seconds 3000 orders (localhost). don't want miss time. i see 2 ways make faster: create cache every filter , update lifetime (horrible) the interesting can right in ordersearch->search() method $query method. don't understand how can pass in controller. example of code 2nd way: class ordersearch extends order { public $totalsum; public function search($params) { $query = order::find(); $dataprovider = new activedataprovider([ 'query' => $query, ]); $this->load($params); $this->totalsum = $query->sum('order_total'); // works fast return $dataprovider; } } after i
Read more

java - Suppress Jboss version details from HTTP error response -

-
my jboss verson jboss eap 6.3 when kind of error response sent jboss, adds server information response. following sample row response: http/1.1 400 bad request server: apache-coyote/1.1 content-type: text/html;charset=utf-8 content-length: 2391 date: tue, 19 jul 2016 09:30:46 gmt connection: close jboss web/7.4.8.final-redhat-4 - jbweb000064: error report jbweb000065: http status 400 - org.codehaus.jackson.map.jsonmappingexception: can not construct instance of mybean.type string value 'xyz': value not 1 of declared enum instance names @ [source: org.jboss.resteasy.core.interception.messagebodyreadercontextimpl$inputstreamwrapper@5e421c2b; line: 14, column: 26] (through reference chain: requestargs["request"]) jbweb000309: type jbweb000067: status report jbweb000068: message org.codehaus.jackson.map.jsonmappingexception: can not construct instance of mybean.type string value 'xyz': value not 1 of declared enum instance names @ [source: org.jboss
Read more

Sass watch command compiles .scss files before full sftp upload -

-
i use winscp download , edit .scss files , sass on linux (on server) compile them .css . after saving file, use: sass scss/style.scss css/style.css , replaces css file compiled sccs. the problem i want skip part return command line after editing scss file, sake of automation , saving time. but, if use watch command: sass --watch scss/style.scss:css/style.css synchronize 2 files, alerts nonexistent css errors pop up: change detected to: scss/style.scss error scss/style.scss (line 232: invalid css after "...ht: bold; line-": expected "{", "") note that when file uploads quicker usual (sometimes happens) watch command job, no errors. this because, when file upload takes time, sass compiles scss file (on server) before uploaded remote folder. thus, compiles part of file, resulting in css errors. is there way set timer watch command waits few seconds after detects changes , before compiling? any other way overcome is, of course,
Read more