Django - How can i resize the svg in the html template

I just created a matplot figure from a csv in django (line graph) and rendering it to the html template and I can't modify its dimensions

imgdata = io.StringIO()
        fig.savefig(imgdata, format='svg')
        imgdata.seek(0)
        data = imgdata.getvalue()
        return data
    data = isolate(selected_loc)
    return render(request, 'hello.html', {'data': data, 'locations' : list(locations)})

html template

<div class="figure" style="">{{ data|safe }}</div>

i tried styling the div in css

.figure {
        width: 40%;
        height: 500px;
      }

and it doesnt working only the div container expands but not the svg that just rendered

enter image description here

xml.etree.ElementTree is a python library that allows you to parse and manipulate svgs.

Side note -> IDK what's happening with the 2 return statements, but I am going to assume I am ignorant as opposed to you being wrong, because presumably your svg is being shown.

import xml.etree.ElementTree as ET
from io import StringIO

# this might've been the user defined function "isolate"
# for the time being, this is my best guess
def isolate(fig):
    # this will write the output of the figure into a string in an SVG format
    imgdata = io.StringIO()
    fig.savefig(imgdata, format='svg')
    imgdata.seek(0)
    data = imgdata.getvalue()

    # then you can do something like this to read the SVG into a tree
    # create a tree
    tree = ET.parse(data)
    # get the root
    root = tree.getroot()

    # whatever the namespace is typically "http://www.w3.org/2000/svg"
    # elements are the elements you are looking for
    for e in root.findall("{namespace}elements"):
        e.attrib["attribute_to_set"] = ""

    # set the "root" css values for height and width
    root.attrib["height"] = "100%"
    root.attrib["width"] = "100%"

    # tree.write() saves the file so you can write it to a BytesIO or StringIO
    imgdata = io.BytesIO()
    # the below should work.
    tree.write(imgdata)
    # then do more things with it

    return imgdata
    # this looks like it went into another function somewhere

# also my best guess for what this function looked like
def my_view(request):
    data = isolate(selected_loc)
    # some transform of data happened here to be able to send it
    # to the django template rendering system to be used
    return render(request, 'hello.html', {'data': data, 'locations' : list(locations)})

Your css should also work, but I think you should be attaching it to the svg itself and not the container. There is a chance that some style is taking precedence over the style you're trying to apply, so you could always add an !important at the end of it, like so, border: solid black 1px !important; to rule that out.

Given the information above, you have 2 options; Either use the CSS below or use the etree code and remove the svg {...} css I have below.

If you don't have an id attached to the svg itself, you would have to select it:

svg
{
    width: 100%;
    /*height: 100%;*/
}
.container
{
    width: 40%;
    height: 500px;
}