Why is text column so narrow when view portrait on a phone?

The banner fits nicely but the text on the phone version is very narrow, only a word or two per line. I don't know how to adjust this.

Please try injecting the following code in your form: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes 

@media only screen and (max-width: 480px) {

[data-type="control_fullname"]{

    width: 100% !important;

}

.form-sub-label-container {

    width: 100% !important;

    float: left !important;

}

.form-line {

    padding: 8px !important;

}

}

Let us know if you need more help.