*{
  margin: 0;
  padding: 0;
}

html {
  font-size: 3vw;
}
@media screen and (min-width: 640px) {
  html {
     font-size: 20px;
  }
}

body{
  font-family: arial;
  padding: 0;
  line-height: 2;
  background-image: linear-gradient(rgba(0,0,0,0.7),rgba(0,0,0,0.7)), url(background.jpg);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  min-height: 100vh;
  color: #fff;
}

#main-container{
  max-width: 20rem;
  background-color: rgb(50, 125, 50);
  background-color: rgba(50, 125, 50, 0.8);
  border-radius: 1rem;
  padding: 1rem 2rem;
  margin: 3rem auto;
}

#input-container{
  display: flex;
  align-items: center;
  justify-content: space-between;
}

h1{
  font-size: 2rem;
  letter-spacing: 0.3rem;
}

h2{
  font-size: 1rem;
}

h1,h2,hr{
  text-align: center;
  margin-top: 1rem;
  margin-bottom: 1rem;
}

input{
  font-size: 1rem;
  min-width: 2rem;
}

li{
  font-size: 1.3rem;
}

ul{
  list-style: none;
}

li{
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: 0.5rem;
  overflow: hidden;
  transition: background-color 0.2s, color 0.5s;
}

span{
  transition: transform 1s;
}

li:hover{
  background-color: rgb(50, 125, 50);
}

.done{
  text-decoration: line-through;
  color: #333;
}

.deleted.done{
  text-decoration: inherit;
  color: inherit;
}

.btn{
  margin-left: 15px;
  border-radius: 25%;
  width: 2rem;
  height: 2rem;
  background-color: #444;
  background-size: 75%;
  background-repeat: no-repeat;
  background-position: center;
  z-index: 10;
  transition: transform 0.2s;
}

.btn:hover{
  transform: scale(1.2);
}

.add-btn{
  background-image: url(Add-light.png);
}

.add-btn:hover{
  background-image: url(Add-strong.png);
}

.delete-btn{
  background-image: url(Garbage-Closed.png);
}

.delete-btn:hover,
.delete-btn:visited{
  background-image: url(Garbage-Open.png);
}