Spacing between field and description

Your problem is being caused by the following rule in your themes style.css adding a 24px bottom margin to all your inputs.

[css]
.entry-content input {
margin: 0 0 24px 0;
}

To correct your problem you can either modify that rule and zero the bottom margin or you can add something like the following to the bottom of your stylesheet which should override the above style and reduce the gap between your input and it's description

[css]
.gform_wrapper input[type="text"], .gform_wrapper input[type="url"], .gform_wrapper input[type="email"], .gform_wrapper input[type="tel"], .gform_wrapper input[type="number"], .gform_wrapper input[type="password"] {
margin-bottom: 0 !important;
}