我想使用CSS来集中这个提交按钮,并且已经在其他许多在线帖子中对此进行了研究,但还没有找到解决方案,这对于那些应该如此简单的事情来说似乎很奇怪。为什么这个css不在这个表单上的提交按钮的中心?
td.class > div {
width: 100%;
height: 100%;
overflow: hidden;
height: 20px;
}
#buttonstyle {
border: 2px solid #777777;
background: #019966;
color: black;
font: bold 18px'Trebuchet MS';
padding: 4px;
cursor: pointer;
width: 150px;
border-radius: 12px;
display: inline-block;
margin: 0px auto;
}
.buttonHolder {
text-align: center;
}
.heading {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 16px;
font-weight: bold;
text-align: center;
color: #006633;
}
input {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10px;
font-weight: normal;
}
input[type=text] {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 12px;
font-weight: normal;
}
input[type=date] {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 12px;
font-weight: normal;
}
ul {
list-style: none;
text-align: left;
}
input {
width: 20px;
position: relative;
left: 150px;
vertical-align: middle;
}
label {
width: 200px;
position: relative;
left: -20px;
display: inline-block;
vertical-align: middle;
}
<form name="InstructorForm" action="../instructorDB_protected/instructorDB_controller.php" method="post" enctype="multipart/form-data">
<div id='content'>
<center>
<span class="heading">Colorado Mountain Club - Boulder Group Instructor Database<br>Instructor Administrator Export Form</span>
</p>
<p>
Select which schools to export to a file to download.
<br>The file will contain a list of instructor names, emails and phone numbers:
<p>
<div id="yourdiv" style="display: inline-block;">
<ul>
<li>
<input type="checkbox" name="avi_instructor">
<label>Avalanche:</label>
</li>
<li>
<input type="checkbox" name="hiking_instructor">
<label>Hiking:</label>
</li>
<li>
<input type="checkbox" name="ice_instructor">
<label>Ice:</label>
</li>
<li>
<input type="checkbox" name="rock_instructor_trad">
<label>Rock, Trad:</label>
</li>
<li>
<input type="checkbox" name="rock_instructor_sport">
<label>Rock, Sport:</label>
</li>
<li>
<input type="checkbox" name="ski_instructor">
<label>Ski:</label>
</li>
<li>
<input type="checkbox" name="snow_instructor">
<label>Snow:</label>
</li>
</ul>
</div>
<br>
<div class="buttonHolder">
<input id=buttonstyle type="submit" name="submitAdminExport" value="Export">
</div>
<br>
<a href="../instructorDB_protected/instructorDB_top.php" target="_self">Return to top</a>
</center>
</div>
</form>
我已经尝试去除得到加载其他三个CSS文件,这并没有任何区别:提交按钮拒不中心,并赞同沿着复选框的右边缘,在它上面的列表中。任何帮助非常感谢!