*{
  padding: 0;
  margin: 0;
}

body{
  font-family: Arial, Helvetica, sans-serif;
  background: #ddd;
}

.todo{
  background: white;
  width: 500px;
  padding: 20px;
  border-radius: 8px;
  margin: 10% auto;
  box-shadow: 0 1px 2px #aaa;
}

table {
  margin-top: 20px;
  width: 100%;
}

td, th {
  border: 1px solid #eee;
  padding: 6px;
}

.form {
  width: 100%;
  margin-top: 30px;
}

input {
  padding: 6px;
  border-radius: 6px;
  border: 1px solid #aaa;
  width: calc(100% - 12px);
  margin-bottom: 10px;
}

.submit {
  background: black;
  color: white;
  padding: 8px;
  cursor: pointer;
  width: 100%;
  border-radius: 6px;
  margin-top: 20px;
  border: none;
}