grid.css

*,
*:before,
*:after {
  box-sizing: border-box;
}

body {
  margin: 10px;
  font-family: 'Open Sans', 'sans-serif';
  background-color: #fff;
  color: #444;
}

h1,
p {
  margin: 0 0 1em 0;
}

.wrapper {
  max-width: 940px;
  margin: 0 20px;
  display: grid;
  grid-gap: 10px;
}


/* no grid support? */

.wrapper {
  display: flex;
  flex-wrap: wrap;
}

.wrapper {
  display: grid;
  margin: 0 auto;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  grid-auto-rows: minmax(150px, auto);
}

.panelFrontEnd,.panelBackEnd {
  /* needed for the flex layout*/
  margin-left: 5px;
  margin-right: 5px;
  display: none;
  flex-direction: row;
 /* flex: 1 1 200px; */
}
.panelDemo {
  margin-left: 5px;
  margin-right: 5px;
  display: none;
  flex-direction: column;
}

.header,
.footer {
  margin-left: 5px;
  margin-right: 5px;
  flex: 0 1 100%;
  grid-column: 1 / -1;
}

.wrapper > * {
  background-color: #e9e6e6;
  color: #000;
  border-radius: 5px;
  padding: 20px;
  font-size: 150%;
  margin-bottom: 10px;
}
img{
  width: 100px;
}

/* We need to set the margin used on flex items to 0 as we have gaps in grid.  */

@supports (display: grid) {
  .wrapper > * {
    margin: 0;
  }
}