*{
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
.container{
  width: 100%;
  min-height:100vh;
  background: linear-gradient(135deg, #153677, #4e085f);
  padding: 10px;

}
.todo-app{
  width: 100%;
  max-width: 540px;
  background: #fff;
  margin: 100px auto 20px;
  padding: 40px 30px 70px;
  border-radius: 10px;
}
.header{
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}

.header h1{
  color: #002765;
}

.header img{
  width: 30px;
}

.row{
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #edeef0;
  border-radius: 30px;
  padding-left: 20px;
  margin-bottom: 25px;
}

.row input{
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  padding:10px;
  font-size: 14px;
}

.row button{
  border: none;
  outline: none;
  background: #ff5945;
  padding: 16px 50px;
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  border-radius: 40px;
}

ul li{
   list-style: none;
   font-size: 17px;
   padding: 12px 8px 12px 50px;
   user-select: none;
   cursor: pointer;
   position: relative;
   display: flex;
   align-items: center;
   justify-content:space-between;
}

ul li::before{
   content: '';
   position: absolute;
   height: 28px;
   width: 28px;
   border-radius: 50%;
   background-image: url(images/unchecked.png);
   background-size:cover;
   background-position: center;
   top: 10px;
   left: 8px;

}

ul li.checked{
   color: #555;
   text-decoration: line-through;
}

ul li.checked::before{
  background-image: url(images/checked.png);
}

ul li img{
  width: 20px;
}