Create styles.css

styles.css

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+/* Body Styling */
+body {
+    font-family: Arial, sans-serif;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    height: 100vh;
+    margin: 0;
+    background-color: #f4f4f9;
+}
+
+/* Calculator Container */
+.calculator {
+    background-color: #fff;
+    padding: 20px;
+    border-radius: 10px;
+    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
+}
+
+/* Display Area */
+.display {
+    width: 100%;
+    height: 50px;
+    margin-bottom: 20px;
+    background-color: #222;
+    color: white;
+    font-size: 2rem;
+    text-align: right;
+    padding: 10px;
+    border-radius: 5px;
+    border: none;
+}
+
+/* Button Grid Layout */
+.buttons {
+    display: grid;
+    grid-template-columns: repeat(4, 1fr);
+    gap: 10px;
+}
+
+/* Individual Buttons */
+.buttons button {
+    padding: 20px;
+    font-size: 1.5rem;
+    border-radius: 5px;
+    background-color: #f0f0f0;
+    border: 1px solid #ddd;
+    cursor: pointer;
+}
+
+/* Button Hover Effect */
+.buttons button:hover {
+    background-color: #d0d0d0;
+}
+
+/* Button Active Effect */
+.buttons button:active {
+    background-color: #b0b0b0;
+}
+
+/* Equal Button Styling */
+.equal {
+    background-color: #4CAF50;
+    color: white;
+}
+
+/* Clear Button Styling */
+.clear {
+    background-color: #f44336;
+    color: white;
+}