* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family:
    "Trebuchet MS", "Lucida Sans Unicode", "Lucida Grande", "Lucida Sans",
    Arial, sans-serif;
}

@view-transition{
  navigation: auto;
}

header {
  background-color: #f9f9fa;
  display: flex;
  height: 168px;
  padding: 0 30px;
}

header ul {
  display: flex;
  align-items: center;
  height: 168px;
  justify-content: end;
  gap: 80px;
}

header ul li {
  list-style: none;
  text-transform: uppercase;
}

header li a {
  text-decoration: none;
  color: black;
  font-weight: bold;
}

nav {
  flex-grow: 1;
}

#card_cont {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-evenly;
}

.product_card {
  border: 5px solid red;
  border-radius: 20px;
  margin: 20px;
  padding: 15px;
  width: 300px;
  box-shadow: 1px 1px 15px gray;
}

main {
  background-color: chartreuse;
  padding: 20px 20px 60px 20px;
  min-height: calc(100vh - 168px - 50px);
}

.my_table{
  border-collapse: collapse;
  margin-bottom: 50px;
}

.my_table th, .my_table td{
  border: 3px solid blue;
  width: 80px;
  padding: 5px;
  text-align: center;
}

.not_current_month{
  opacity: 0.5;
}

#current_date{
  font-weight: bold;
  background-color: blue;
  color: white;
}

.my_table td:not(.not_current_month):hover{
  background-color: darkgreen;
  color: white;
}

footer {
  background-color: darkgray;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50px;
  text-align: center;
  line-height: 50px;
}

#main_area{
  background-color: tomato;
  padding: 10px;
  display: flex;
  gap: 10px;
}

#left_area{
  background-color: wheat;
  flex-grow: 1;
  padding: 10px;
}

#left_area p{
  background-color: aqua;
  margin: 10px;
}

#right_area{
  background-color: cadetblue;
  width: 300px;
  flex-grow: 0;
  flex-shrink: 0;
}