@media screen and (min-width: 1281px) {
  #container{
    width: 500px;
  }
}

@media screen and (max-width: 1280px) {
  #container{
    width: 550px;
  }
}

@media screen and (max-width: 980px) {
  #container{
    width: 70%;
  }
}

@media screen and (max-width: 736px) {
  #container{
    width: 80%;
  }
}

@media screen and (max-width: 480px) {
  #container{
    width: 90%;
  }
}

body{
  font-family: Roboto;
  background: #1F1C2C;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to right, #928DAB, #1F1C2C);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to right, #928DAB, #1F1C2C); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */  
}
h1{
  background: #ea7cbe;
  color: white;
  margin: 0;
  padding: 10px 20px;
  text-transform: uppercase;
  font-size: 24px;
  font-weight: normal;
}
ul{
  list-style: none;
  margin: 0;
  padding: 0;
}
li{
  background: #fff;
  height: 40px;
  line-height: 40px;
  color: #666;
}
li:nth-child(2n){
  background: #f7f7f7;
}
input{
  font-size: 18px;
  color: #ea7cbe;
  background-color: #f7f7f7;
  width: 100%;
  padding: 13px 13px 13px 20px;
  box-sizing: border-box;
  border: 3px solid rgba(0, 0, 0, 0);
}
input:focus{
  background: #fff;
  border: 3px solid #ea7cbe;
  outline: none;
}
#container{
  margin: 100px auto;
  background: #f7f7f7;
  box-shadow: 0 0 3px rgba(0, 0, 0, 0.1);
}
.completed{
  color: gray;
  text-decoration: line-through;
}
.fa-plus-circle,
.fa-minus-circle{
  float: right;
}
span{
  background: #e74c3c;
  height: 40px;
  margin-right: 20px;
  text-align: center;
  color: white;
  width: 0px;
  display: inline-block;
  transition: 0.2s linear;
  opacity: 0;
}
li:hover span{
  width: 40px;
  opacity: 1.0;
}