body:before {

font-family: Helvetica, Arial, Sans-Serif;
content: "oh no! build error!";
position: absolute;
top: 0;
left: 0;
right: 0;
height: 100px;
background-color: rgb(141, 55, 55);
text-align: center;
font-size: 2.5em;
line-height: 2.5em;
color: whitesmoke;
text-shadow: -1px -1px rgba(0, 0, 0, 0.2);
z-index: 100000;

}

body:after {

font-family: Helvetica, Arial, Sans-Serif;
content: '{REPLACE_ERRORS}';
position: absolute;
top: 100px; left: 0; right: 0;
padding: 20px 50px;
font-size: 1.25em;
color: black;
background-color: whitesmoke;
border-bottom: 1px solid #aaa;
z-index: 100000;

}