Open Modal Button Appears As Gray

We dont provide any styling for front end stuff other than the modals themselves, Your buttons should be styled via your themes stylesheet so they should already match your theme.

The blue button in preview is just to show an example and i believe uses the following styles.

button {
    font: 300 18px/1.125 "Oswald";
    color: #fff;
    background: #00b7cd;
    box-shadow: none;
    border: 0;
    padding: 5px 10px 7px;
    cursor: pointer;
    transition: transform .5s;
}

Awesome! Thanks!