css background-image doesn't work on table object - html

Question

in my Django app I would like to put a background image in a table. The problem is that the image doesn't show. This is the code:
<table style="background-image: url('/static/assets/img/myimage.png') ;background-position: 0 100% !important;background-repeat: repeat-x ;background-size: 40px 3px">
Hello!
</table>
If I put the same css style in div object all work. Eg:
<div style="background-image: url('/static/assets/img/myimage.png') ;background-position: 0 100% !important;background-repeat: repeat-x ;background-size: 40px 3px">
Hello!
</div>
Where is my mistake? Thanks a lot for the help
EDIT1
I would like to insert a email html file in a django template. I use 'include' and all works for image but doesn't works for background-image style. The image location is correct (if I use 'div' and not 'table' all works). I have bootstrap
EDIT2
This the complete code. In the table I don't see the background image
<!-- ======= section ======= -->
<table border="0" width="100%" cellpadding="0" cellspacing="0" bgcolor="34302d" style="background-image: url('http://themastermail.com/envato/omail/demo/layout2/img/testi-bg.jpg') !important; background-size: cover; background-position: top center; background-repeat: no-repeat;" background="http://themastermail.com/envato/omail/demo/layout2/img/testi-bg.jpg">
<tr><td height="60" style="font-size: 60px; line-height: 60px;"> </td></tr>
<tr>
<td align="center">
<table border="0" width="590" align="center" cellpadding="0" cellspacing="0" class="container590">
<tr>
<td>
<table border="0" width="580" align="center" cellpadding="0" cellspacing="0" class="container580">
<tr>
<td align="center" style="color: #b9bcc7; font-size: 16px; font-family: 'Open Sans', Calibri, sans-serif; line-height: 30px;" class="title_color">
<!-- ======= section text ====== -->
<div style="line-height: 30px">
<em>Proin eget massa tincidunt, lobortis ex nec, placerat odio. Mauris gravida nulla id laoreet ornare. Maecenas sagittis elit metus, eget pellentesque couleur non categorize rouge vert bleu.</em>
</div>
</td>
</tr>
</table>
</td>
</tr>
<tr><td height="35" style="font-size: 35px; line-height: 35px;"> </td></tr>
<tr>
<td align="center">
<table border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td align="left" width="80">
<img src="http://themastermail.com/envato/omail/demo/layout2/img/testi-img.png" style="display: block; width: auto;" width="70" border="0" alt=""/>
</td>
<td align="left" style="color: #ffffff; font-size: 14px; font-family: Raleway, Calibri, sans-serif; mso-line-height-rule: exactly; line-height: 24px;" class="title_color">
<!-- ======= section header ======= -->
<div style="line-height: 24px;">
Marta Clarcks<br>envato.com
</div>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<tr><td height="60" style="font-size: 60px; line-height: 60px;"> </td></tr>
</table>
<!-- ======= end section ====== -->

Answer 1

You left out the ! on your !important tag.
<table style="background-image: url('/static/assets/img/myimage.png') !important;background-position: 0 100% !important;background-repeat: repeat-x !;background-size: 40px 3px">
Hello!
</table>
but as you've not got a tr, td etc in your field it may still not display it, you should try:
<table style="background-image: url('/static/assets/img/myimage.png') !important;background-position: 0 100% !important;background-repeat: repeat-x !;background-size: 40px 3px; display: block;">
<tr>
<td>
<p>hello</p>
</td>
</tr>
</table>

Answer 2

try this
<table style="background-image: url('static/assets/img/myimage.png') !important;background-position: 0 100% !important;background-repeat: repeat-x !;background-size: 40px 3px">
<tr><td>Hello!</td></tr>
</table>
folder structure
css.css
static/