:root {
  --dust-grey: #D8D8D8;
  --alabaster-grey: #E4E4E4;
  --bright-snow: #F7F7F7;
  --white-smoke: #F2F2F2;
  --dust-grey-2: #D4D4D4;

  /* extra readable colors */
  --text-dark: #3A3A3A;
  --border-grey: #BEBEBE;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: var(--text-dark);

  background-image: url(https://i.pinimg.com/1200x/35/9c/a1/359ca16c6bc8a116f23693401535d41f.jpg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

/* CONTAINER */
#container {
  width: 100%;
  max-width: 1000px;
  margin: auto;
  padding: 10px;
  box-sizing: border-box;
}

/* HEADER */
#header {
  border-radius: 60px 60px 0 0 / 30px 30px 0 0;
  max-width: 1000px;
  height: 200px;

  background-image: url(https://i.ibb.co/LhbGx6Js/videoframe-0.png);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;

  border-bottom: 6px solid var(--border-grey);

  display: flex;
  align-items: center;
  justify-content: center;

  color: var(--bright-snow);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

/* NAV BAR */
#topbar {
  border-radius: 0 0 60px 60px / 0 0 30px 30px;

  background: rgba(247, 247, 247, 0.88);

  padding: 15px;
  text-align: center;

  border-bottom: 2px solid var(--border-grey);
}

/* MAIN CONTENT */
#content {
  text-align: center;

  background: rgba(242, 242, 242, 0.9);

  padding: 20px;
  margin-top: 10px;

  border: 1px solid var(--dust-grey-2);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);

  color: var(--text-dark);

  border-radius: 5px 20px 6px;
}

/* FOOTER */
#footer {
  background: rgba(228, 228, 228, 0.92);

  padding: 15px;
  text-align: center;
  margin-top: 10px;

  border-top: 2px solid var(--border-grey);
}

/* BOXES */
.box {
  background: rgba(216, 216, 216, 0.85);

  padding: 15px;
  border-radius: 10px;
  margin-top: 20px;

  border: 1px solid var(--border-grey);
}

/* LINKS */
a {
  color: #5A5A5A;
}

a:hover {
  color: #2F2F2F;
}

/* MOBILE */
@media screen and (max-width: 768px) {

  #header {
    height: 150px;
  }

  #content {
    padding: 15px;
  }

  #topbar {
    font-size: 14px;
    padding: 10px;
  }

  .box {
    padding: 12px;
  }
}