add input-with-prefix.md

snippets/input-with-prefix.md

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+---
+title: Input with Prefix
+tags: visual,interactivity,intermediate
+---
+
+Creates an input with a visual, non-editable prefix.
+
+- Create a parent element, containing the prefix and the input 
+- Remove border and outline from the input, and apply it to the parent element, to give it the appearance of an input box
+- Use `:focus-within` selector to change the parent element style accordingly
+
+```html
+<div class="input-box">
+  <span class="prefix">R$</span>
+  <input />  
+</div>
+```
+
+```css
+.input-box {
+  display: flex;
+  align-items: center;
+  
+  max-width: 300px;  
+  border: 1px #A0AEC0 solid;
+  border-radius: 4px;
+  padding-left: 0.5rem;
+  overflow: hidden;
+  
+  font-family: sans-serif;
+  
+  transition: border-color 0.5s ease;
+}
+
+.input-box:focus-within, .input-box:hover {
+  border-color: #38B2AC;
+}
+
+.input-box .prefix {
+  font-weight: 300;
+  font-size: 14px;
+  color: #A0AEC0;
+}
+
+.input-box:focus-within .prefix, .input-box:hover .prefix { 
+  color: #38B2AC;
+}
+
+
+.input-box input {
+  flex-grow: 1;
+  
+  border: none;
+  outline: none;
+  padding: 0.5rem;
+  
+} 
+
+```