style.css

* {
  font-family: "Gamja Flower", cursive;
  font-weight: 600;
}

body {
  margin: 0;
  background-color: white;
  background-repeat: no-repeat;
  background-size: cover;
}

.container {
  background-image: url(images/pink.png);
  min-height: 100vh;
  box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
  max-width: 800px;
  border-top: 10px solid blanchedalmond;
  border-bottom: 10px solid blanchedalmond;
  height: 100%;
  min-height: 100vh;
}

.inputArea {
  margin-bottom: 30px;
  position: relative;
}

.taskArea {
  border: 5px solid white;
}

.taskTabs {
  display: flex;
  position: relative;
}

.taskTabs div {
  padding: 1rem;
  cursor: pointer;
}

#underline {
  top: 52px;
  left: 0;
  height: 5px;
  position: absolute;
  background-color: coral;
  width: 60px;
  padding: 0;
  transition: 0.3s;
}

.task {
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding: 1rem;
  border-top: 1px solid white;
  position: relative;
}

.task button {
  border-radius: 5px;
}

.taskDone {
  text-decoration: line-through;
}

button {
  background-color: #04aa6d;
  border: none;
  color: white;
  width: 30px;
  height: 30px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}

#addButton {
  border-radius: 5px;
}

#taskInput {
  width: 80%;
  border: none;
}