With the following code pieces you can style the header and footer element according to your wishes:
.slide-header {
/*Adjust background-color*/
background: rgba(0, 0, 0, 0.2);
/*Adjust height*/
height: 12%;
/*Adjust font-size*/
font-size: 8vh;
/*Adjust font-color*/
color: #fff;
}
.slide-header .text{
/*Adjust font-family*/
font-family: 'Open Sans', Arial, sans-serif;
}