html - Centering <a> in <div> -


i trying <a> tags centered in div#teacherpageoptions. centered in microsoft expression web, not when view page in browser. doing wrong?

#blackbar {    background-color: chartreuse;    padding: 10px;    height: 57px;  }  html {    height: 100%;  }  body,  #teacherpage {    min-height: 100%;    background-color: #f4f4f4;  }  hr {    visibility: hidden;  }  .center {    padding-bottom: 50px;    padding-top: 50px;  }  .button {    display: block;    width: 115px;    height: 25px;    background: chartreuse;    padding: 10px;    text-align: center;    border-radius: 5px;    color: white;    font-weight: bold;  }  .button1 {    display: block;    width: 115px;    height: 25px;    background: #008dde;    padding: 10px;    border-radius: 5px;    color: white;    font-weight: bold;    position: absolute;  }  p {    color: white;    font-weight: bold;    line-height: 40px;  }  .auto-style1 {    /* make username hang little left. */    margin-left: 53px;  }  #teacherpage {    height: 327px;    background-color: gray;  }  #teacherpageoptions {    margin-left: auto;    margin-right: auto;    height: auto;  }  .auto-style2 {    margin-right: 0px;  }  .wrapper {    text-align: center;  }  .auto-style3 {    margin-bottom: 0px;  }  {    height: 100%;    opacity: 0.5;    width: 100%;  }  a:hover {    opacity: 1;    -webkit-transform: scale(3);    -ms-transform: scale(3);    transform: scale(3);  }
<div id="blackbar" class="auto-style3">    <a href="login2.php" class="button" style="float:left; text-decoration: none;"> logout  </a>     <p style=" float:right; height: 36px;" class="auto-style1">username      <?php session_start(); echo $name=$ _session[ 'name'] ?>    </p>  </div>  <hr>    <div id="teacherpageoptions">      <div class="wrapper" style="height:100px "><a href="makequestions.php" class="button1" style="text-decoration: none"> make questions </a>       <div class="center"></div>      <a href="makeexam.php" class="button1" style="text-decoration: none"> make exam </a>    </div>  </div>

remove position: absolute; .button1 , add margin: 0 auto; instead.

#blackbar {    background-color: chartreuse;    padding: 10px;    height: 57px;  }  html {    height: 100%;  }  body,  #teacherpage {    min-height: 100%;    background-color: #f4f4f4;  }  hr {    visibility: hidden;  }  .center {    padding-bottom: 50px;    padding-top: 50px;  }  .button {    display: block;    width: 115px;    height: 25px;    background: chartreuse;    padding: 10px;    text-align: center;    border-radius: 5px;    color: white;    font-weight: bold;  }  .button1 {    display: block;    width: 115px;    height: 25px;    background: #008dde;    padding: 10px;    border-radius: 5px;    color: white;    font-weight: bold;    /* position: absolute; */    margin: 0 auto;  }  p {    color: white;    font-weight: bold;    line-height: 40px;  }  .auto-style1 {    /* make username hang little left. */    margin-left: 53px;  }  #teacherpage {    height: 327px;    background-color: gray;  }  #teacherpageoptions {    margin-left: auto;    margin-right: auto;    height: auto;  }  .auto-style2 {    margin-right: 0px;  }  .wrapper {    text-align: center;  }  .auto-style3 {    margin-bottom: 0px;  }  {    height: 100%;    opacity: 0.5;    width: 100%;  }  a:hover {    opacity: 1;    -webkit-transform: scale(3);    -ms-transform: scale(3);    transform: scale(3);  }
<div id="blackbar" class="auto-style3">    <a href="login2.php" class="button" style="float:left; text-decoration: none;"> logout  </a>     <p style=" float:right; height: 36px;" class="auto-style1">username      <?php session_start(); echo $name=$ _session[ 'name'] ?>    </p>  </div>  <hr>    <div id="teacherpageoptions">      <div class="wrapper" style="height:100px "><a href="makequestions.php" class="button1" style="text-decoration: none"> make questions </a>       <div class="center"></div>      <a href="makeexam.php" class="button1" style="text-decoration: none"> make exam </a>    </div>  </div>


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