* {
  /* universal */
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Calibri';
}

body {
  margin: 0;
  font-family: sans-serif;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
  border: 1px solid #7FC7D9;
}

hr {
  margin-top: 10px;
  margin-bottom: 10px;
}

.head {
  z-index: 10;
  padding: 5px;
  padding-right: 20px;
  padding-left: 20px;
  margin-left: 0px;
  font-weight: bold;
  font-size: 20px;
  color:  #0F1035;
}

.head.active {
  color: #7FC7D9;
}

main {
  min-height: 630px;
  display: flex;
  justify-content: center;
  padding: 5px;
}

.case {
  display: flex;
  flex-wrap: wrap; 
  width: 100%;
  margin: 5px;
  align-items: flex-start; 
  border: solid 1px #DCF2F1;   
  padding: 10px;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

.softcase {
  padding-left: 5px;
  padding-right: 5px;
  width: 25%;
}

.card {
  border: 1px solid #7FC7D9;
  margin-bottom: 15px;
  border-radius: 5px; 
  padding: 10px;
  padding-top: 10px;
  color: #0F1035;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

.card-body {
  min-height: 100px;
}

a {
  text-decoration: none;
  color: #7FC7D9;
}

a:hover {
  text-decoration: none;
  color: white;
}

button {
  padding: 5px;
  padding-left: 10px;
  padding-right: 10px;
  border-radius: 3px;
  border: 1px solid #0F1035;
  background-color: #0F1035;
  color: #DCF2F1;
  cursor: pointer;
  font-size: 16px;
}

canvas { 
  margin: 10px auto; 
  display: block; 
}

@media screen and (max-width: 1000px) {
  main {
    flex-direction: column;
  }

  .case, .softcase, .card {
    width: 100%;
    flex-direction: column;
  }
}