Gravity Forms Align Button To The Right

General information for the website: Gravity Forms
Kind of development: Customization of existing website
Description of every page/module: How to RIGHT align the gravity forms submit button in a 4 column custom gravity form in Wordpress.
Description of requirements/features: I have a gravity form I have created with 4 horizontal columns. I found the short code someone online. I want the submit button to the far right of the 4th button and IN LINE with the entire row. What is the code / who can provide the correct code to RIGHT alight a gravity forms submit button. The code you provide cannot break the current layout of the 4 column form.
I want the best correct code for doing 3, 4, 5 columned forms in Gravity Forms.

I want to also customize th ebackground colour of the form and change the font sizes of a

On my page the gravity form dropdown placeholder font size is smaller than the other fields on the same page.

I checked many support blogs and found this to be an answer but it still keeps the placeholder dropdown field font a different size somehow. ( http://stackoverflow.com/questions/34196020/gravity-forms-select-placeholder-styling )

How do I keep the font in the first box the same font size and style as boxes 2,3 and 4 ?

I tried this code but it does not work.
/*
Gravity Form Placeholder font edit
—————————————————————————————————- */
::-webkit-input-placeholder {
font-family: @tahoma;
color: $placeholder-color;
font-size: 16px;
}

:-moz-placeholder { /* Firefox 18- */
font-family: @tahoma;
color: $placeholder-color;
font-size: 16px;
}

::-moz-placeholder { /* Firefox 19+ */
font-family: @tahoma;
color: $placeholder-color;
font-size: 16px;
}

:-ms-input-placeholder {
font-family: @tahoma;
color: $placeholder-color;
font-size: 16px;
}

.ginput_container_select select:first-child {
font-family: @tahoma;
color: $placeholder-color;
font-size: 20px;



You must be good with gravity forms, css, avada theme and wordpress. It should be as simple as just providing the code, if you are good at it you know it already and its a quick buck for you. No chancers, I want to see proof that you have managed to do this.
Specific technologies required: Gravity Forms, Worpdress, Avada Theme
Extra notes: