* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  padding: 2rem;
  height: 100vh;
  font-family: Poppins, sans-serif;
  position: relative;
  background: #111;
}

h1 {
  font-weight: 600;
  text-align: center;
  color: #fff;
  margin-bottom: 2rem;
}
h3 {
  font-weight: 600;
}
.calendar {
  margin: auto;
  width: 100%;
  max-width: 480px;
  padding: 3rem;
  background: #a45d5d;
  border-radius: 30px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  
}
.calendar header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.calendar nav {
  display: flex;
  align-items: center;
}
.calendar ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  text-align: center;
}
.calendar ul li {
  width: calc(100% / 7);
  margin-top: 25px;
  position: relative;
  z-index: 2;
}
#prev,
#next {
  width: 20px;
  height: 20px;
  position: relative;
  border: none;
  background: transparent;
  cursor: pointer;
}
#prev::before,
#next::before {
  content: "";
  width: 50%;
  height: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  border-style: solid;
  border-width: 0.25em 0.25em 0 0;
  border-color: #ccc;
}
#next::before {
  transform: translate(-50%, -50%) rotate(45deg);
}
#prev::before {
  transform: translate(-50%, -50%) rotate(-135deg);
}
#prev:hover::before,
#next:hover::before {
  border-color: #000;
}
.days {
  font-weight: 600;
}
.dates li.today {
  color: #fff;
}
.dates li.today::before {
  content: "";
  width: 2rem;
  height: 2rem;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #000;
  border-radius: 50%;
  z-index: -1;
}
.dates li.inactive {
  color: #ccc;
}