html {
  margin: 0;
  padding: 2rem;
  font-family: sans-serif;
}
h1 {
  text-align: center;
}
body {
  width: 19rem;
  height: 40rem;
  background: linear-gradient(45deg, rgba(0,0,0,20%), rgba(0,0,0,5%));
}
.toDoList {
  text-align: center;
}
.btnAdd, .btnRemove {
  padding: 5px;
  background-color: rgba(255,255,255,50%);
  border: none; 
  border-radius: 5px; 
  box-shadow: -1px 1px 3px rgba(0,0,0,70%), 
    inset 1px -1px 5px rgba(255,255,255,80%);
}
.checked {
  text-decoration: line-through;
}
#task, li, .inputAdd {
  padding: 5px;
  margin: 10px 40px 10px 0;
  border: none;
  border-radius: 5px;
  background-color: rgba(255,255,255,50%);
  box-shadow: inset -1px 1px 5px rgba(0,0,0,70%), 
    1px -1px 5px rgba(255,255,255,80%);
}
.inputAdd {
  width: 100%;
  height: 2rem;
  text-align: center;
}
.btnAdd {
  width: 104%;
}
.btnRemove {
  position: fixed;
  right: 2rem;
}
.listItem {
  height: 1.5rem;
  text-align: left;
}
span {
  padding: 0 3px;
  border-radius: 5px;
  box-shadow: -1px 1px 3px rgba(0,0,0,70%), 
    1px -1px 5px rgba(255,255,255,50%);
}