Hello, professor, above there is my coding, I didn’t know how to link my html to my domain, so I am sending the coding here first. Please, help me set it up later.

    <title>Zhongjie wright| Hello, World!</title>

<style>

    * {
        margin: 0;
        padding: 0;
        border: none;
        color: white;
        text-decoration: none;

    }

    body {
        background-color:black;
        font-family: futura,"Times New Roman", Times, serif;
        text-align: center
    }

    main {
        background-color:#559;
        width:700px;
        margin-left: auto;
        margin-right: auto;
        padding: 30px 30px 30px 30px;
        margin-top: 60px;
    }

    H1{
        color: cornflowerblue;
        font-size: 50px;
        text-align: center;
        text-transform: uppercase;
        letter-spacing:normal;
        margin-top: 50px;
        margin-bottom: -40px;
        font-family: "Helvetica Neue", Arial, sans-serif;

    }

    figcaption {
        background-color:inherit;
        margin-bottom: 40px;
        padding:0px;
    }

    img {
        display: block
    }

    figure {

        border-radius: 40px;
        overflow: hidden;
    }

    </style>

</head>

<body>

<H1>Hello World!</H1>

    <main>

<figure>

<img src="giphy.gif" alt="gif of an earth apearing and desapearing">

<figcaption>Design Cartoon GIF by Here Studio</figcaption>

    </figure> 

    <P>Computer Science is relatively new, but "Hello, World!" is one of its ldesr traditions. "Hello, World!" programs are very basic, displaying (or outputting) the phrase "Hello, World!". They are used by coders to learn the basic syntax of a new programming language, or as "sanity testes" to diagnose bugs during development. 
    </P>
    </main>

</body>