add styles

src/components/Header/Header.module.css

+.Header {
+    padding: 10px 0;
+}
+
 .Header__link {
+    border: 1px solid blueviolet;
+    border-radius: 10px;
+    padding: 10px 15px;
     text-decoration: none;
     color: black;
 }
\ No newline at end of file

src/components/ProductForm/ProductForm.module.css

+.ProductForm {
+    width: 80%;
+    margin: 20px auto;
+    display: flex;
+    align-items: center;
+    flex-direction: column;
+}
+
+.ProductForm__input {
+    margin: 10px 0;
+    min-height: 20px;
+    border-radius: 7px;
+    padding: 10px;
+    min-width: 400px;
+}
+
+.ProductForm__button {
+    background: inherit;
+    border: 1px solid blueviolet;
+    padding: 10px 15px;
+    border-radius: 5px;
+}
+
 .ProductForm__fileInput {
     display: none;
 }
\ No newline at end of file

src/components/ProductForm/ProductForm.tsx

@@ -40,14 +40,15 @@ const ProductForm: FunctionComponent = (): ReactElement => {
         dispatch(createProduct(formData))
     }
     return (
-        <div className={styles.ProductForm}>
-            <form onSubmit={submitHandler}>
+        <div className={styles.ProductForm__frame}>
+            <form className={styles.ProductForm} onSubmit={submitHandler}>
                 <input 
                     name={'product'} 
                     type="text" 
                     placeholder="Title" 
                     value={product.product}
                     onChange={inputHandler}
+                    className={styles.ProductForm__input}
                 />
                 <input 
                     name={'price'} 
@@ -55,6 +56,7 @@ const ProductForm: FunctionComponent = (): ReactElement => {
                     placeholder="Price" 
                     value={product.price}
                     onChange={inputHandler}
+                    className={styles.ProductForm__input}
                 />
                 <input 
                     name={'description'} 
@@ -62,6 +64,7 @@ const ProductForm: FunctionComponent = (): ReactElement => {
                     placeholder="Description" 
                     value={product.description}
                     onChange={inputHandler}
+                    className={styles.ProductForm__input}
                 />
                 <label>
                     <input 
@@ -76,7 +79,7 @@ const ProductForm: FunctionComponent = (): ReactElement => {
                     <span>{fileName}</span>
                     
                 </label>
-                <button>SEND</button>
+                <button className={styles.ProductForm__button}>SEND</button>
             </form>
         </div>
     )