RatioBuddy - Aspect ratio calculator

.outer {
  position: relative;
  &:before {
    display: block;
    content: "";
    width: 100%;
    padding-top: (9 / 16) * 100%;
  }
  > .inner {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
}
  

<picture>
    <source srcset="smaller_landscape.jpg" media="(max-width: 40em) and (orientation: landscape)">
    <source srcset="smaller_portrait.jpg" media="(max-width: 40em) and (orientation: portrait)">
    <source srcset="default_landscape.jpg" media="(min-width: 40em) and (orientation: landscape)">
    <source srcset="default_portrait.jpg" media="(min-width: 40em) and (orientation: portrait)">
    <img srcset="default_landscape.jpg" alt="My default image">
</picture>

//If you wish to apply this on both desktop and mobile
#blockID {
  max-width:150px;
  margin:auto;
}

//If you wish to apply this on mobile only
@media screen and (max-width:767px) {

#blockID {
  max-width:150px;
  margin:auto;
}

}

# extract images from pdf file
import fitz
doc = fitz.open("file.pdf")
for i in range(len(doc)):
    for img in doc.getPageImageList(i):
        xref = img[0]
        pix = fitz.Pixmap(doc, xref)
        if pix.n < 5:       # this is GRAY or RGB
            pix.writePNG("p%s-%s.png" % (i, xref))
        else:               # CMYK: convert to RGB first
            pix1 = fitz.Pixmap(fitz.csRGB, pix)
            pix1.writePNG("p%s-%s.png" % (i, xref))
            pix1 = None
        pix = None

# STEP 1
# import libraries
import fitz
import io
from PIL import Image
  
# STEP 2
# file path you want to extract images from
file = "/content/pdf_file.pdf"
  
# open the file
pdf_file = fitz.open(file)
  
# STEP 3
# iterate over PDF pages
for page_index in range(len(pdf_file)):
    
    # get the page itself
    page = pdf_file[page_index]
    image_list = page.getImageList()
      
    # printing number of images found in this page
    if image_list:
        print(f"[+] Found a total of {len(image_list)} images in page {page_index}")
    else:
        print("[!] No images found on page", page_index)
    for image_index, img in enumerate(page.getImageList(), start=1):
        
        # get the XREF of the image
        xref = img[0]
          
        # extract the image bytes
        base_image = pdf_file.extractImage(xref)
        image_bytes = base_image["image"]
          
        # get the image extension
        image_ext = base_image["ext"]