* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  list-style: none;
}
body {
  background-color: rgb(200, 185, 185);
}
h1,
h2 {
  text-transform: uppercase;
}
.container {
  width: 90vw;
  margin: auto;
  padding: 20px;
  margin-top: 15px;
  border-radius: 10px;
  box-shadow: 5px 5px 30px black;
  background-color: rgba(255, 255, 255, 0.433);
}
#header {
  color: brown;
  font-size: 35px;
  text-align: center;
}
.box {
  padding: 10px;
  background-color: aliceblue;
}
.btn {
  border: none;
  font-size: 18px;
  margin-left: 15px;
  border-radius: 8px;
  padding: 10px 15px;
  margin-top: 5px;
  background-color: #fff;
  transition: all 0.4s linear;
}
.btn:hover {
  background-color: #b2b2b2;
}
.addNewTask {
  padding: 15px;
  font-size: 18px;
  margin-top: 15px;
  text-align: center;
}
input[type="text"] {
  padding: 5px;
  font-size: 18px;
  margin: 10px 0;
  border-color: #fff;
}
.mainContainer {
  margin-top: 25px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.todoList,
.completeList {
  padding: 20px;
  width: 46%;
}
.mainContainer .item {
  margin: 5px 0;
  padding: 10px;
  font-size: 18px;
  border-top: 1px solid #dbdbdb;
}

.mainContainer .item input[type="checkbox"] {
  margin-right: 3px;
}

.delete {
  background-color: rgb(239, 74, 74);
}

/* ---------- Responsive ---------- */
@media only screen and (min-width: 320px) and (max-width: 767px) {
  .mainContainer {
    display: block;
  }
  .todoList,
  .completeList {
    width: 100%;
  }
  .todoList {
    margin-bottom: 20px;
  }
  .btn {
    margin-top: 10px;
  }
}