I've just started to try and build a golf stats website (just for the fun of it). I'm very new to HTML and CSS, and I'm having loads of trouble with one page that just won't behave as I would expect.
I've cut the code down a bit a save space, but here is what I'm getting. http://jsfiddle.net/fnnb1o6d/1/
I want everything to be centered like the top text boxes, but the that's not happening. I'm sure I have some terrible CSS and HTML going on here which is why I'm getting the issues, but I can't work out what it is.
The html and css are also below. Can someone please tell me how I would get this to behave as I would like? Thanks very much
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Add Course</title>
<link href="styles/styles.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="add_course">
    <form action="add_course.php" method="post" enctype="multipart/form-data" name="add_course_form" id="add_course_form" onsubmit="return validate_form();">
    <div class="add_course_lables">
        <input class="add_course_name" name="coursename" type="text" id="coursename" size="30" placeholder="Course Name" maxlength="64" />
        <br />
        <input  name="par" type="text" id="par" size="30" placeholder="Par" maxlength="2" />
    <input name="rating" type="text" id="rating" size="30" placeholder="Rating" maxlength="2" />
    <input name="slope" type="text" id="slope" size="30" placeholder="Slope" maxlength="3" /> 
    <br />
</div>
<div style="min-width: 1000px; overflow: auto; display: table; width: 1000px; text-align:center" id="add_course_table">  
    <div>
        <div style="width:60px"  id="add_course_top_row">Hole</div>
        <div id="add_course_top_row">1</div>
        <div id="add_course_top_row">2</div>
        <div id="add_course_top_row">3</div>
        <div id="add_course_top_row">4</div>
        <br style="clear: left;" /> 
    </div>
    <div>               
        <div id="add_course_other_rows_left">Par</div>
        <div id="add_course_other_rows"><input type="text" maxlength="1" name="par1"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="1" name="par2"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="1" name="par3"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="1" name="par4"/></div>
        <br style="clear: left;" />
    </div>
    <div>
        <div id="add_course_other_rows_left">Length</div>
        <div id="add_course_other_rows"><input type="text" maxlength="3" name="length1"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="3" name="length2"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="3" name="length3"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="3" name="length4"/></div>
        <br style="clear: left;" />            
    </div>
    <div>
        <div id="add_course_other_rows_left">Index</div>
        <div id="add_course_other_rows"><input type="text" maxlength="2" name="index1"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="2" name="index2"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="2" name="index3"/></div>
        <div id="add_course_other_rows"><input type="text" maxlength="2" name="index4"/></div>
    </div>
</div>  
    <input type="submit" name="Submit" class="add_course_button"  value="Add Course"  />
</form>
</div>
</body>
</html>
CSS
.add_course_lables {
    width: 500px;
    height: 120px;
    border-radius: 5px 5px 0px 0px;
    margin-left: auto;
    margin-right: auto;
}
.add_course_lables input {
    color: #16a085;
    padding: 10px;
    margin-top: 5px;
    width:135px;
    font-size: 15px;
    border: 1px solid #16a085;
    border-bottom: 2px solid #16a085;
    border-radius: 5px;
    transition:border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
}
.add_course_lables .add_course_name {
    width:91.5%;
}
.add_course_lables input:focus {
    border-color:#2ecc71;
    outline: none;
    box-shadow: 0 0 2px 1px #2ecc71;
}
.add_course_lables input:hover {
    border-color:#2ecc71;
    outline: none;
    box-shadow: 0 0 2px 1px #2ecc71;
}
.add_course_button{
    background: #16a085;
    color: white;
    border: 1px solid #16a085;
    border-radius: 5px;
    transition: background .4s linear;
    padding: 10px;
    font-weight: 600;
    font-size: 20px;
    cursor: pointer;
    margin-top: 10px;
    position: relative;
    left: 50%;
    right: 0%;
}
#add_course_top_row{
    border-radius: 4px;
    border-color: #FFFFFF;
    border-style: solid;
    background: #16A085;
    color: #FFFFFF;
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    text-align: center;
    padding: 2px;
    margin-right: 0px;
    width: 30px;
    border-width: thin;
    display: inline-flex;
}
#add_course_other_rows_left{
    color: #16a085;
    border-radius: 4px;
    border-color: #16a085;
    border-style: solid;
    border-width: thin;
    background: #FFFFFF;
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    text-align: center;
    padding: 2px;
    margin-right: 3px;
    margin-top:2px;
    width: 60px;
    float:left;
}
#add_course_other_rows input {
    color: #16a085;
    border-radius: 5px;
    border color:#BFBFBF;
    border-style: solid;
    border-width: thin;
    font-family: 'Open Sans', sans-serif;
    font-size: 15px;
    text-align: center;
    padding: 3px;
    margin-top: 2px;
    margin-right:3px;
    width: 30px;
    float:left;
}
#add_course_other_rows input:hover {
    border-color:#2ecc71;
    outline: none;
    box-shadow: 0 0 2px 1px #2ecc71;
}
 
     
     
     
     
     
     
    