Margin? Options

[RockHudson]

Can some one help? I am not very conversant with CSS and I want to fix a problem I have and I can't find the answer.
I am writing code for the website that I have created and despite changing several margin parameters in the stylesheet it will not give me a margin on the left hand side.(see image)
Here is the code for the content where the text is placed:

CODE

<div class="content">
        <h1>Welcome 'Lets IoT with Arduino' Website</h1>
        <p><strong>This website has been created for enthusiasts who love making gadgets with this flexible microprocessor board.  </strong>.</p>
        <p>It is our intention to make this site a focus for Arduino users and make available links and pages of useful information for <strong>Arduino enthusiasts.</strong> </p>
        <p>We have become passionate about IoT and have used many IoT modules to automate our home.  Using WiFi gadgets we can even talk to our gadgets with Amazon Alexa, Google Nest and the like.</p>
        <p>My aim for this website is to put all in one place links to useful sites as well as notes and articles concerning the vast
        array of components available to construct useful gadgets which make life much easier in our home.</p>
        <p>Although this site is based around the use of the Arduino microprocessor, some of the items mentioned in this site will work without the Arduino, but can become controlled by the Arduino as a means of control.</p>
        
      </div>

I have attached a copy of the CSS stylesheet.
Please help?