*{
  margin: 0;
  padding: 0;
  font-family: 'poppings', sans-serif;
  box-sizing: border-box;
}

.container{
  width: 100%;
  min-height: 100vh;
  background: linear-gradient(90deg, rgba(7,1,105,1) 0%, rgba(66,66,191,1) 35%, rgba(136,97,162,1) 100%);
  padding: 10px;
}

.todoapp{
  width: 100%;
  max-width: 540px;
  background: #fff;
  margin: 100px auto 100px;
  padding: 40px 30px 70px;
  border-radius: 15px;
}
.todoapp h2{
  color: rgb(19, 16, 16);
  display: flex;
  align-items: center;
  margin-bottom: 20px;
}
.todoapp h2 img{
  width: 30px;
  margin-left: 15px;
}

.row{
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: rgb(184, 235, 237);
  border-radius: 30px;
  padding-left: 20px;
  margin-bottom: 25px;
}
input{
  flex: 1;
  border: none;
  outline: none;
  background: #b8ebed;
  padding: 15px;
  font-weight: 14px;
}
button{
  border: none;
  outline: none;
  padding: 16px 45px;
  background-color:rgba(81, 156, 200, 0.974) ;
  color: whitesmoke;
  border-radius: 45px;
  font-size: 15px;
  cursor: pointer;
}

ul li{
  list-style: none;
  font-size: 16px;
  padding: 12px 8px 12px 50px;
  user-select: none;
  cursor: pointer;
  position: relative;
}
ul li::before{
  content: '';
  position: absolute;
  height: 28px;
  width: 28px;
  border-radius: 50px;
  background-image: url(images/unchecked.png);
  background-size: cover;
  background-position: center;
  top: 9px;
  left: 8px;
}
ul li.checked{
  color: #555;
  text-decoration: line-through;
}
ul li.checked::before{
  background-image: url(images/checked.png);
}

ul li span{
  position: absolute;
  right: 0;
  top: 5px;
  width:  40px;
  height: 40px;
  font-size: 22px;
  color: #555 ;
  line-height: 40px;
  text-align: center;
  border-radius: 50px;
}

ul li span:hover{
  background-color: #edeef0;
}