*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.main-section,
.upper-section,
.bottom-section{
  display: flex;
  align-items:center;
  justify-content: center;
  flex-direction: column;
  gap: 20px;
}
.main-section{
  margin-top: 30px;
}
.upper-section{
  align-items: flex-end;
  gap: 20px;
  font-size: 30px;
}
input{
  padding: 8px;
  font-size: 20px;
  border-radius: 7px;
  margin-left: 10px;
  border: 1px solid black;
}
input:focus{
  outline: 1px solid green;
  border: none;
}
.upper-section button{
  font-size: 24px;
  padding: 5px 31px;
  background: blue;
  border: 1px solid blue;
  border-radius: 4px;
  color: white;
  transition: .3s;
}
.upper-section button:hover{
  color: blue;
  background-color: transparent;
  cursor: pointer;
}
.task{
  border: 1px solid;
    font-size: 3rem;
    padding: 10px;
    width: 300px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border-radius: 5px;
}