Hello @espliko
This issue will be fixed in the next update of Parallel which will be released in the next few days.
In the mean time you can find the following CSS code in the style.css file and change the min-width to 100% instead of 800px.
.contact input,
.contact input[type="text"],
.contact input[type="email"],
.contact input[type="submit"],
.contact textarea {
min-width: 800px;
width: 100%;
}