html {
    min-height: 100%;
}

body {
    margin: 0;
    min-height: 100vh;

    background: #000000;

    color: #ffffff;

    font-family:
        "Times New Roman",
        serif;

    position: relative;
}


/* animated gif background */

body::before {
    content: "";

    position: fixed;

    inset: 0;

    background:
        url("background.gif")
        center top / cover repeat;

    opacity: 0.65;

    z-index: -1;
}


/* main expanding box */

.container {
    width: 700px;

    margin:
        30px auto;

    box-sizing: border-box;

    background:
        linear-gradient(
            to bottom,
            rgba(0, 0, 0, 0.10),
            rgba(0, 0, 0, 0.45),
            rgba(0, 0, 0, 0.80)
        );

    border: 1px solid;

    border-image:
        linear-gradient(
            to bottom,
            #ffffff,
            #333333,
            #ffffff
        ) 1;
}


/* everything inside the box */

.content {
    padding: 20px;

    box-sizing: border-box;
}


/* title */

h1 {
    margin-top: 0;
}


/* normal text */

p {
    font-size: 16px;

    line-height: 22px;
}
```