.header, .footer {
/*background-image:url(
);*/
background:
linear-gradient(
limegreen,
transparent
),
linear-gradient(
90deg,
skyblue,
transparent
),
linear-gradient(
-90deg,
coral,
transparent
);
background-blend-mode: screen;
);*/
background:
linear-gradient(
limegreen,
transparent
),
linear-gradient(
90deg,
skyblue,
transparent
),
linear-gradient(
-90deg,
coral,
transparent
);
background-blend-mode: screen;

);
background-repeat:no-repeat;
background-position:top;
background-size:48px;
text-align:center;
}