body {
  background: #e7e7e7; background-image: url("cropped-cat-header-3.jpg"); 
  font-family: Verdana, sans-serif; 
  font-size: 11pt;
  margin: 2rem;
  line-height: 1.5;
}
#page { background: #ffffff; margin: 50px; border: 2px solid #c0c0c0; padding: 10px; }
#header { background: #4b6983; border: 2px solid #7590ae; text-align: center; padding: 10px; color: #ffffff; }
#header h1 { color: #ffffff; }
#body { padding: 10px; }
span.tt { font-family: monospace; }
span.bold { font-weight: bold; }

.centered {
  display: flex;
  flex-direction: column;
  align-items: center;
}
form > label {
  display: block;
  margin: .5rem 0;
}
button {
  margin-top: .5rem;
}
.msg {
  margin-top: .5rem;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
ul {
  list-style: none;
  padding-left: 0;
}
li {
  margin-bottom: .8rem;
}

input,
textarea {
  field-sizing: content;
  min-width: 200px;
  max-width: 500px;
}
.calendar {
  width: 350px;
  background-color: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}
.calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
}
.calendar-header button {
  background-color: transparent;
  border: none;
  font-size: 1.5em;
  cursor: pointer;
}
#month-year {
  font-size: 1.2em;
  font-weight: bold;
}
.calendar-weekdays, .calendar-dates {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}
.calendar-weekdays div, .calendar-dates div {
  text-align: center;
  padding: 10px;
}
.calendar-weekdays {
  background-color: #eaeef3;
}
.calendar-weekdays div {
  font-weight: bold;
}
.calendar-dates div {
  border-bottom: 1px solid #eaeef3;
  cursor: pointer;
}
.calendar-dates div:hover {
  background-color: #f1f1f1;
}