---
id: 60b69a66b6ddb80858c51594
title: 步驟 30
challengeType: 0
dashedName: step-30
---
# --description--
將圓點移至適當位置，爲此，將 `display` 設置爲 `block`、將 `margin` 設置爲 `auto`，並將 `margin-top` 設置爲 `65%`。
# --hints--
`.black-dot` 選擇器應該有一個 `display` 屬性設置爲 `block`。
```js
assert(new __helpers.CSSHelp(document).getStyle('.black-dot')?.display === 'block');
```
`.black-dot` 選擇器應該有一個 `margin` 屬性設置爲 `auto`。
```js
assert(new __helpers.CSSHelp(document).getStyle('.black-dot')?.margin?.includes('auto'));
```
`.black-dot` 選擇器應該有一個 `margin-top` 屬性設置爲 `65%`。
```js
assert(new __helpers.CSSHelp(document).getStyle('.black-dot')?.marginTop === '65%');
```
# --seed--
## --seed-contents--
```html
Picasso Painting
```
```css
body {
background-color: rgb(184, 132, 46);
}
#back-wall {
background-color: #8B4513;
width: 100%;
height: 60%;
position: absolute;
top: 0;
left: 0;
z-index: -1;
}
#offwhite-character {
width: 300px;
height: 550px;
background-color: GhostWhite;
position: absolute;
top: 20%;
left: 17.5%;
}
#white-hat {
width: 0;
height: 0;
border-style: solid;
border-width: 0 120px 140px 180px;
border-top-color: transparent;
border-right-color: transparent;
border-bottom-color: GhostWhite;
border-left-color: transparent;
position: absolute;
top: -140px;
left: 0;
}
#black-mask {
width: 100%;
height: 50px;
background-color: rgb(45, 31, 19);
position: absolute;
top: 0;
left: 0;
z-index: 1;
}
#gray-instrument {
width: 15%;
height: 40%;
background-color: rgb(167, 162, 117);
position: absolute;
top: 50px;
left: 125px;
z-index: 1;
}
.black-dot {
width: 10px;
height: 10px;
background-color: rgb(45, 31, 19);
border-radius: 50%;
--fcc-editable-region--
--fcc-editable-region--
}
```