Provide an example of a valid HTML code for a simple text box and submit button.
An example of a valid HTML code for a simple text box and submit button is:

```
<form>
    <input type="text" placeholder="Enter text here" />
    <input type="submit" value="Submit" />
</form> 
```
Complete the following task based on the instruction and optional input provided.### Instruction:
Provide an example of a valid HTML code for a simple text box and submit button.

### Output:
An example of a valid HTML code for a simple text box and submit button is:

```
<form>
    <input type="text" placeholder="Enter text here" />
    <input type="submit" value="Submit" />
</form> 
```