How to create a completely flexible piano keyboard with HTML and CSS

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I\'m trying to create a piano keyboard that will keep it\'s elements ratios using flex box, but can\'t seem to make the black notes stay the same width or height once I star

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暗喜

2021-01-16 06:57

Not sure if you need your black keys to be independent blocks but here is an example

<body>
 <div class="note-container">
 <div class="white-note black-note"></div> 
 <div class="white-note black-note"></div>
 <div class="white-note"></div> 
 <div class="white-note black-note"></div>
 <div class="white-note black-note"></div> 
 <div class="white-note black-note"></div>
 <div class="white-note"></div> 
 <div class="white-note black-note"></div>
 <div class="white-note black-note"></div> 
 <div class="white-note"></div>
</div>

body {
  background: #000;
}

.note-container {
  width: 100%;
  display: flex;
  flex-flow: row nowrap;
}

.white-note {
  position: relative;
  width: 10%;
  height: 400px;
  background: #fff;
  margin: 0 2px;
}

.white-note.black-note:after {
  content: "";
  position: absolute;
  top: 0;
  right: -25%;
  width: 50%;
  height: 50%;
  background: #000;
  z-index: 1;
}

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星月不相逢

2021-01-16 07:05
The position should be relative rather than absolute. Also you should set both the height of the containing divs to 100%.

Refer to the Fiddle link: http://jsfiddle.net/924sefae/6/
```
#kbd {
  height: 100%;
  ...
}
#kbd {
  height: 100%;
  ...
}

.black {
  position: relative;
  ...
}
```
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臣服心动

2021-01-16 07:08

Demo @ Codepen

Flexbox is not required for this. A responsive keyboard layout can be accomplished with:

additional class selectors that correspond with the note of each key:

<div class="key white c"      </div>
<div class="key black c_sharp"</div>
<div class="key white d"      </div>
<div class="key black d_sharp"</div>
<div class="key white e"      </div>
<div class="key white f"      </div>
<div class="key black f_sharp"</div>
<div class="key white g"      </div>
<div class="key black g_sharp"</div>
<div class="key white a"      </div>
<div class="key black a_sharp"</div>
<div class="key white b"      </div>

a margin for all black keys & each white key which precedes a black key, using an offset based on the black key's size:

.a, .b, .d, .e, .g, .black{
  margin: 0 0 0 (-($blackKey_Width / 2) - $blackKey_BorderWidth);
}

the following key placement attributes:

.key{
  float:    left;
  position: relative;
}

a higher z-index for the black keys:

.white{
  z-index: 1;
}
.black{
  z-index: 2;
}

Viewport Units [vw, vh, vmin, vmax] for the (height & width) attributes of the (.white & .black) selectors. You can make this even more dynamic by sizing the black keys as a percentage of the white keys.

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予麋鹿

2021-01-16 07:20

Percentage height is calculated based on the height of the first positioned parent. In this case, the #keys and #kbd divs don't have a position CSS rule. This means the black keys are scaled based on the width of the body, instead of their direct parent.

Add position: relative; to the #keys div to make it work properly.

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