styles.css

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

h1 {
  font-size: 45px;
}

.main {
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  flex-direction: column;
  padding-top: 10%;
}

.input-block {
  width: 50%;
  display: flex;
  justify-content: space-between;
  margin-bottom: 40px;
}

.input-field {
  flex: 1;
  height: 50px;
  border-radius: 5px;
  border: #ccc 1px solid;
  outline: none;
  margin-right: 20px;
  font-size: 16px;
}

.btn {
  min-height: 50px;
  padding: 15px 35px;
  cursor: pointer;
  font-size: 16px;
  background-color: rgb(52, 50, 50);
  color: rgb(231, 229, 229);
  border: none;
  transition: background-color 0.4s ease;
  border-radius: 5px;
 display: flex;
 align-items: center;
 justify-content: center;
}

.btn:hover {
  opacity: 0.8;
}

.list-container {
  width: 50%;
}

ol {
  padding-left: 10px;
}

li {
  font-size: 16px;
  padding-left: 10px;
  margin-bottom: 10px;
}

.item {
  max-width: 70%;
}

.list-flex,.btn-flex {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.btn.done, .btn.delete {
  padding: 10px 20px;
  min-height: 30px;
}

.btn.done {
  background-color: rgb(44, 150, 115);
  margin-right: 20px;
}

.btn.delete {
  background-color: rgb(226, 30, 138);
}

.checked {
  width: 30px;
  height: 30px;
  border: #000 1px solid;
  border-radius: 5px;
  position: absolute;
  left: -50px;
  background-image: url(/check-line.svg);
  background-size: 80%;
  background-repeat: no-repeat;
  background-position: center;
}