* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  }

html,
body {
width: 100%;
height: 100%;
}

body {

```
min-height: 100vh;

/* ==========================
   宇宙背景
   ========================== */

background-image:
    url("space-bg.webp");

background-size: cover;

background-position: center;

background-repeat: no-repeat;

background-attachment: fixed;

color: white;

overflow: hidden;
```

}

/* ==============================
Matrix Canvas
============================== */

#matrix {

```
position: fixed;

top: 0;
left: 0;

width: 100vw;
height: 100vh;

/*
   Canvas 本身完全透明
   不會遮住宇宙背景
*/
background: transparent;

/*
   Matrix 在背景上面
*/
z-index: 10;

/*
   不阻擋滑鼠操作
*/
pointer-events: none;
```

}