fix: replace .english.md extension with .md

curriculum/challenges/english/01-responsive-web-design/css-flexbox/use-the-align-self-property.md

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+---
+id: 587d78af367417b2b2512b00
+title: Use the align-self Property
+challengeType: 0
+videoUrl: 'https://scrimba.com/p/pVaDAv/cMbvzfv'
+forumTopicId: 301107
+---
+
+## Description
+<section id='description'>
+The final property for flex items is <code>align-self</code>. This property allows you to adjust each item's alignment individually, instead of setting them all at once. This is useful since other common adjustment techniques using the CSS properties <code>float</code>, <code>clear</code>, and <code>vertical-align</code> do not work on flex items.
+<code>align-self</code> accepts the same values as <code>align-items</code> and will override any value set by the <code>align-items</code> property.
+</section>
+
+## Instructions
+<section id='instructions'>
+Add the CSS property <code>align-self</code> to both <code>#box-1</code> and <code>#box-2</code>. Give <code>#box-1</code> a value of <code>center</code> and give <code>#box-2</code> a value of <code>flex-end</code>.
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: The <code>#box-1</code> element should have the <code>align-self</code> property set to a value of <code>center</code>.
+    testString: assert($('#box-1').css('align-self') == 'center');
+  - text: The <code>#box-2</code> element should have the <code>align-self</code> property set to a value of <code>flex-end</code>.
+    testString: assert($('#box-2').css('align-self') == 'flex-end');
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='html-seed'>
+
+```html
+<style>
+  #box-container {
+    display: flex;
+    height: 500px;
+  }
+  #box-1 {
+    background-color: dodgerblue;
+
+    height: 200px;
+    width: 200px;
+  }
+
+  #box-2 {
+    background-color: orangered;
+
+    height: 200px;
+    width: 200px;
+  }
+</style>
+
+<div id="box-container">
+  <div id="box-1"></div>
+  <div id="box-2"></div>
+</div>
+```
+
+</div>
+
+
+
+</section>
+
+## Solution
+<section id='solution'>
+
+```html
+<style>
+  #box-container {
+    display: flex;
+    height: 500px;
+  }
+  #box-1 {
+    background-color: dodgerblue;
+    align-self: center;
+    height: 200px;
+    width: 200px;
+  }
+
+  #box-2 {
+    background-color: orangered;
+    align-self: flex-end;
+    height: 200px;
+    width: 200px;
+  }
+</style>
+
+<div id="box-container">
+  <div id="box-1"></div>
+  <div id="box-2"></div>
+</div>
+```
+
+</section>