instaground.css

*, *:before, *:after {
  box-sizing: border-box;
}
html {
  height: 100%;
}
body {
  height: 100%;
  background-color: black;
  margin: 0;
  padding: 0.2em;
  font-family: arial, sans-serif;
}
img{
  max-width: 100%;
}
#background-container {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  z-index: -1;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
}
.tab, #clear-history, #download {
  background: rgba(50, 50, 50, 0.4);
  padding: 8px 15px;
  border: 0;
  color: white;
  font-weight: bold;
  font-size: 0.8em;
}
#download{
  float: right;
  text-decoration: none;
}
.tab-content {
  color: white;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
}
.history-image{
  padding: 2em;
background-color: rgba(50,50,50,0.7);
}
.error-message {
  background: rgba(50, 50, 50, 0.5);
  height: 30%;
  width: 30%;
  color: white;
  border: black solid 0.2em;
  padding: 1em;
  text-align: center;
  font-weight: bold;
  font-family: arial, sans-serif;
  margin: 28vh auto;
  min-width: 15em;
  display: none;
}