style.css

body {
  padding: 0;
  margin: 0;
  background-color: rgba(0, 0, 0, 0.1);
  font-family: 'Titillium Web', sans-serif;
}

/* ------------ container ------------ */
.container {
  padding: 10px;
  width: 380px;
  margin: 100px auto 0;
}

/* ------------ header ------------ */
.header {
  color: rgb(0, 68, 255);
  font-size: 36px;
  font-weight: bolder;
  padding: 10px;
  text-align: center;
  font-family: 'Courier New', Courier, monospace;
}

/* ------------ content ------------ */
.content {
  width: 380px;
  height: 350px;
  max-height: 350px;
  background-color: #fff;
  overflow: auto;
  border-radius: 0 0 10px 10px;
}
.content::-webkit-scrollbar {
  display: none;
}
.content ul {
  padding: 0;
  margin: 0;
}
.item {
  width: 380px;
  height: 45px;
  min-height: 45px;
  position: relative;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  list-style: none;
  padding: 0;
  margin: 0;
}
.item i.co {
  position: absolute;
  font-size: 25px;
  padding-left: 5px;
  left: 15px;
  top: 10px;
}
.item i.co:hover {
  cursor: pointer;
}
.fa-check-circle {
  color: #6eb200;
}
.item p.text {
  position: absolute;
  padding: 5px;
  margin: 0;
  font-size: 20px;
  left: 50px;
  top: 5px;
  background-color: #fff;
  max-width: 285px;
}
.lineThrough {
  text-decoration: line-through;
  color: #ccc;
}
.item i.de {
  position: absolute;
  font-size: 25px;
  right: 15px;
  top: 10px;
}
.item i.de:hover {
  color: #af0000;
  cursor: pointer;
}
/* ------------ add item ------------ */
.add-to-do {
  position: relative;
  width: 360px;
  height: 40px;
  background-color: #fff;
  padding: 10px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 10px 10px 0 0;
  margin-bottom: 5px;
}
.add-to-do i {
  position: absolute;
  font-size: 40px;
  color: #4162f6;
}

.add-to-do input {
  position: absolute;
  left: 50px;
  height: 35px;
  width: 310px;
  background-color: transparent;
  border: none;
  font-size: 20px;
  padding-left: 10px;
}