*{
  box-sizing: border-box;
  margin: 0;
}

.container{
  width: 450px;
  background-color: #ffe0be;
  padding: 10px 20px;
  margin: 30px;
}
.calendar{
  border-collapse: collapse;
  border: 1px solid black;
  width: 100%;
}
.calendar td,th{
  border: 1px solid black;
  text-align: center;
}

.weakDay{
  color: red;
}

.inputDate > div:first-child{
  display: flex;
  justify-content: space-between;
  padding-bottom: 10px;
}
.inputDate > div:last-child{
  width: 100%;

}
.inputDate > div:last-child button{
  width: 100%;
}
#selectDate {
  margin: 25px;
}