---
id: 60b69a66b6ddb80858c515a8
title: Step 51
challengeType: 0
dashedName: step-51
---
# --description--
Usa un selettore dell'attributo `class` per selezionare i nuovi elementi `blue`. Imposta il `background-color` su `#1E90FF`.
# --hints--
Dovresti avere un selettore `.blue`.
```js
assert(new __helpers.CSSHelp(document).getStyle('.blue'));
```
Il selettore `.blue` dovrebbe avere una proprietà `background-color` impostata su `#1E90FF`.
```js
assert(new __helpers.CSSHelp(document).getStyle('.blue')?.backgroundColor === 'rgb(30, 144, 255)');
```
# --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%;
display: block;
margin: auto;
margin-top: 65%;
}
#tan-table {
width: 450px;
height: 140px;
background-color: #D2691E;
position: absolute;
top: 275px;
left: 15px;
z-index: 1;
}
#black-character {
width: 300px;
height: 500px;
background-color: rgb(45, 31, 19);
position: absolute;
top: 30%;
left: 59%;
}
#black-hat {
width: 0;
height: 0;
border-style: solid;
border-width: 150px 0 0 300px;
border-top-color: transparent;
border-right-color: transparent;
border-bottom-color: transparent;
border-left-color: rgb(45, 31, 19);
position: absolute;
top: -150px;
left: 0;
}
#gray-mask {
width: 150px;
height: 150px;
background-color: rgb(167, 162, 117);
position: absolute;
top: -10px;
left: 70px;
}
#white-paper {
width: 400px;
height: 100px;
background-color: GhostWhite;
position: absolute;
top: 250px;
left: -150px;
z-index: 1;
}
.fa-music {
display: inline-block;
margin-top: 8%;
margin-left: 13%;
}
--fcc-editable-region--
--fcc-editable-region--
```