Can you please write a simple static website in there is space for 3 horizontal image slots and 1 slider with the following details:
1. the left most image slot and the rightmost image slot are inputs - the user needs to be able to upload an image 
2. the middle image slot is an output and is the weighted average of the pixel value of the two uploaded images (it is kept blank until both images were uploaded)
3. the slider is located directly below the middle image slot goes from 0 to 1 and determines the weight of the leftmost image in the average. the weight of the rightmost image is (1 - slider_weight)
<!DOCTYPE html>
<html>
  <head>
    <style>
      .image-slot {
        width: 33.33%;
        height: 300px;
        float: left;
        text-align: center;
        position: relative;
        border: 1px solid black;
      }
      .image-slot input[type=file] {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        opacity: 0;
      }
      .image-slot img {
        max-width: 100%;
        max-height: 100%;
      }
      .slider {
        clear: both;
        width: 100%;
        margin-top: 20px;
      }
    </style>
  </head>
  <body>
    <div class=image-slot>
      <input type=file id=left-image onchange=uploadImage(this)>
      <label for=left-image>
        <img id=left-image-preview src=>
      </label>
    </div>
    <div class=image-slot id=middle-image-slot>
      <img id=middle-image src=>
    </div>
    <div class=image-slot>
      <input type=file id=right-image onchange=uploadImage(this)>
      <label for=right-image>
        <img id=right-image-preview src=>
      </label>
    </div>
    <div class=slider>
      <input type=range id=slider min=0 max=1 step=0.01 value=0.5 onchange=updateMiddleImage()>
    </div>

    <script>
      const leftImage = document.getElementById(left-image-preview);
      const rightImage = document.getElementById(right-image-preview);
      const middleImage = document.getElementById(middle-image);
      const slider = document.getElementById(slider);
      let leftImageData;
      let rightImageData;

      function uploadImage(input) {
        const reader = new FileReader();
        reader.onload = function() {
          const image = new Image();
          image.src = reader.result;
          image.onload = function() {
            const canvas = document.createElement(canvas);
            canvas.width = image.width;
            canvas.height = image.height;
            const context = canvas.getContext(2d);
            context.drawImage(image, 0, 0);
            if (input.id === left-image) {
              leftImage.src = reader.result;
              leftImageData = context.getImageData(0, 0, image.width, image.height);
            } else if (input.id === right-image) {
              rightImage.src = reader.result;
              rightImageData = context.getImageData(0, 0, image.width, image.height);
            }
            updateMiddleImage();
          };
        };
        reader.readAsDataURL(input.files[0]);
      }

      function updateMiddleImage() {
        if (!leftImageData || !rightImageData) return;

        const weight = slider.value;
        const canvas = document.createElement(canvas);
        canvas.width = leftImageData.width;
        canvas.height = leftImageData.height;
        const context = canvas.getContext(2d);
        const middleImageData = context.createImageData(leftImageData.width, leftImageData.height);

        for (let i = 0; i < middleImageData.data.length; i += 4) {
          middleImageData.data[i] =
            weight * leftImageData.data[i] + (1 - weight) * rightImageData.data[i];
          middleImageData.data[i + 1] =
            weight * leftImageData.data[i + 1] + (1 - weight) * rightImageData.data[i + 1];
          middleImageData.data[i + 2] =
            weight * leftImageData.data[i + 2] + (1 - weight) * rightImageData.data[i + 2];
          middleImageData.data[i + 3] =
            weight * leftImageData.data[i + 3] + (1 - weight) * rightImageData.data[i + 3];
        }

        context.putImageData(middleImageData, 0, 0);
        middleImage.src = canvas.toDataURL();
      }
    </script>
  </body>
</html>
How can I serve this on a web server on my local network?
To serve this webpage on a web server on your local network, you need to first install a web server software, such as Apache or Nginx, on your computer. Once you have installed the web server software, you will need to configure it to serve your webpage.

Here are the general steps you can follow:

Save the HTML code in a file with a .html extension, such as index.html.

Place the file in the root directory of the web server. The location of this directory will depend on the web server software you are using. For example, in Apache, it is typically located at /var/www/html.

Start the web server software.

Open a web browser and go to http://[your-local-ip-address]/index.html, where [your-local-ip-address] is the IP address of the computer running the web server.

Note that this setup is for serving the webpage on a local network only. If you want to make your webpage accessible from the internet, you will need to configure your router and set up port forwarding to the computer running the web server.