Enhance CSS Styling for NewsShelter Section Fixes sugarlabs#625

Add hover effect in subscribe button improve padding in NewsShelter section
Change the border color and rounded border in email input field
Add proper vertical and horizontal alignment between the email input and the button.

index.html

@@ -4,6 +4,62 @@
 ---
 {% include nav.html %}
 
+<style>
+  .embeddable-buttondown-form {
+    max-width: 500px;
+    font-family: Arial, sans-serif;
+    text-align: center;
+  }
+
+  .form-description {
+    font-size: 16px;
+    margin-bottom: 15px;
+  }
+
+  .form-label {
+    font-weight: bold;
+    margin-bottom: 5px;
+    display: block;
+    text-align: left;
+  }
+
+  .email-input {
+    width: 100%;
+    padding: 10px 15px;
+    margin-bottom: 15px;
+    border: 2px solid #ccc;
+    border-radius: 8px;
+    font-size: 16px;
+    outline: none;
+    transition: border-color 0.3s, box-shadow 0.3s;
+  }
+  .email-input:focus {
+    border-color: #66afe9;
+    box-shadow: 0 0 8px rgba(102, 175, 233, 0.6);
+  }
+  .submit-button {
+    width: 100%;
+    padding: 12px 20px;
+    background-color: #007bff;
+    color: white;
+    border: none;
+    border-radius: 8px;
+    font-size: 16px;
+    cursor: pointer;
+    transition: background-color 0.3s, box-shadow 0.3s;
+  }
+  .submit-button:hover {
+    background-color: #0056b3;
+    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
+  }
+  .submit-button:active {
+    background-color: #004085;
+  }
+  .submit-button:focus {
+    outline: none;
+    box-shadow: 0 0 8px rgba(0, 123, 255, 0.6);
+  }
+</style>
 <!-- Loader -->
 <div id="loaderDiv" class="loader" >
     <div class="loader2">
@@ -96,23 +152,25 @@ <h2 class="text-center customMargin1">Challenging and fun: It's hard fun!</h2>
 <section id="call-to-action">
   <div class="container">
     <div class="row">
-      <div class="col-md-12" >
+      <div class="col-md-12">
         <div class="row justify-content-center">
-          <div class="col-md-6 col-md-push-3" >
-            <h2 >EXCITED?</h2>
+          <div class="col-md-6 col-md-push-3">
+            <h2>EXCITED?</h2>
             <p>The simplest way to get involved is to join our newsletter.</p>
-	    <br>
-	    <form action="https://buttondown.com/api/emails/embed-subscribe/sugarlabs" method="post" class="embeddable-buttondown-form">
-	      <p>Sign up for our mailing list to receive regular
-		news and updates from Sugar Labs.</p>
-	      <label for="email">Email</label>
-	      <input type="email" name="email" placeholder="[email protected]" />
-	      <input type="hidden" value="1" name="embed" />
-	      <input type="submit" value="Subscribe" />
-	    </form>
-	    <br>
-	  </div>
-	</div>
+            <br>
+            <form action="https://buttondown.com/api/emails/embed-subscribe/sugarlabs" method="post"
+              class="embeddable-buttondown-form">
+              <p class="form-description">Sign up for our mailing list to receive regular news and updates from Sugar
+                Labs.</p>
+              <label for="email" class="form-label">Email</label>
+              <div style="display: flex; align-items: flex-start; column-gap: 20px;">
+                <input type="email" name="email" class="email-input" placeholder="[email protected]"/>
+                <input style="max-width: 25%;" type="submit" class="submit-button" value="Subscribe" />
+              </div>
+            </form>
+            <br>
+          </div>
+        </div>
       </div>
     </div>
   </div>