Is there a way to only use CSS in order to make a button have the same width as a sibling button?

Question

Basically, I have two buttons that have the same style and are lined beside each other inside a parent div.

        
                      

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Answer 1

CSS grid can do this:

 body {
  text-align: center
 }
.container {
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  margin:10px;
}

.btn {
  min-height: 44px;
  max-width: 320px;
  box-sizing: border-box;
  padding: 6px 24px border-radius: 4px;
  outline: none;
  cursor: pointer;
}

.btn-primary {
  border: none;
  background-color: #808080;
  color: #FFFFFF;
}

.button1 {
  background-color: #FFFFFF;
  color: #000000;
  border: 1px solid #b6b6b6;
}

.button2 {
  margin-left: 12px;
  padding: 6px 36px;
}

<div  class="container">
  <button class="btn btn-primary button1">Button1</button>
  <button class="btn btn-primary button2">Button2</button>
</div>

<div class="container">
  <button class="btn btn-primary button1">Button1</button>
  <button class="btn btn-primary button2">Button with long text</button>
</div>

<div class="container">
  <button class="btn btn-primary button1">Button1</button>
  <button class="btn btn-primary button2">Button text</button>
</div>

Answer 2

you could also use flex

div {
  justify-content: center;
  display: flex;
}

.btn {
  flex: 1;
  min-height: 44px;
  width: 100%;
  max-width: 320px;
  position: relative;
  box-sizing: border-box;
  padding: 6px 24px;
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}
.btn.btn-primary {
  border: none;
  background-color: #808080;
  color: #FFFFFF;
}
.btn.button1 {
  background-color: #FFFFFF;
  color: #000000;
  border: 1px solid #b6b6b6;
  flex-shrink: 0 !important;
}
.btn.button2 {
  margin-left: 12px;
  width: auto;
  padding: 6px 36px;
}

<div style="text-align: center">
  <button class="btn btn-primary button1">Button1</button>
  <button class="btn btn-primary button2">Button2</button>
</div>

You may also use column CSS

div {
  column-count:2;
  width:max-content;
  margin:auto;
}

.btn {
  min-height: 44px;
  width: 100%;
  max-width: 320px;
  position: relative;
  box-sizing: border-box;
  padding: 6px 24px;
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}
.btn.btn-primary {
  border: none;
  background-color: #808080;
  color: #FFFFFF;
}
.btn.button1 {
  background-color: #FFFFFF;
  color: #000000;
  border: 1px solid #b6b6b6;
  flex-shrink: 0 !important;
}
.btn.button2 {
  margin-left: 12px;
  padding: 6px 36px;
}

<div style="text-align: center">
  <button class="btn btn-primary button1">Button1 longer </button>
  <button class="btn btn-primary button2">Button2</button>
</div>