* {
  margin: 0;
  padding: 0;
}
:root {
  --primary-color: #e1e4eb;
  --secondary-color: #212121;
  --other-color: rgb(204, 203, 203);
}

.dark-theme {
  --primary-color: #000106;
  --secondary-color: #fff;
  --other-color: rgb(51, 50, 50);
}

body {
  background-color: var(--primary-color);
  color: var(--secondary-color);
}
nav {
  background-color: #e74c3c;
  color: aliceblue;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
#icon {
  width: 30px;
  cursor: pointer;
  border-radius: 50%;
}
nav img {
  width: 80px;
  height: auto;
  border: 1px solid black;
}
.logo-and-title {
  display: flex;
  align-items: center;
  gap: 10px;
}
.container {
  width: 100%;
  min-height: 100vh;
  background-color: var(--primary-color);
}
.todo {
  width: 100%;
  max-width: 540px;
  margin: 100px auto 20px;
  padding: 40px 30px 70px;
  border-radius: 10px;
  background-color: var(--other-color);
}
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-weight: 14px;
}
button {
  border: none;
  outline: none;
  background: #e74c3c;
  color: var(--primary-color);
  font-size: 18px;
  cursor: pointer;
  border-radius: 30%;
}
ul li {
  margin-top: 30px;
  list-style: none;
  font-size: 17px;
  padding: 12px 8px 12px 50px;
  cursor: pointer;
  user-select: none;
  position: relative;
}
ul li::before {
  content: "";
  position: absolute;
  height: 28px;
  width: 28px;
  border-radius: 50%;
  background-image: url(uncheked.jpg);
  background-size: cover;
  background-position: center;
  top: 12px;
  left: 8px;
}
ul li.checked {
  color: #555;
  text-decoration: line-through;
}
ul li.checked::before {
  background-image: url(checked.jpg);
}
ul li span{
  position: absolute;
  right:0;
  top:5px;
  width:40px;
  height:40px;
  font-size: 22px;
  color:#555;
  line-height: 40px;
  text-align: center;
}
ul li span:hover{
  background: #e74c3c;
  border-radius: 50%;
}