html {
  font-size: 16px;
}

body {
  background: #fec485;
  font-family:Arial, sans-serif;
}

.app-container {
  display: flex;
}

.todo-container {
  max-width: 300px;
  min-height: 450px;
  height: fit-content;
  height: -moz-fit-content;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
  background-image: radial-gradient(circle 561px at 49% 45.3%, rgba(253, 172, 83, 1) 0%, rgba(253, 104, 83, 0.37) 90.1%);
}

h1 {
   font-family: Arial, sans-serif; 
   color: #2e5b8c;
   font-size: 2.5rem;  
}

.add-item {
  padding: 18px 0;
}

.add-item__input {
  max-width: 170px;
  background: #fdbe79;
  border: none;
  margin-right: 8px;
  color: #407fc4;
  font-size: 1rem;
}

button {
  cursor: pointer;
  background: #fd7866;
  border: none;
  font-size: 1rem;
  padding: 2px 6px;
  height: 24px;
  border-radius: 5px;
  border-bottom: .25em solid #fd6853;
  color: #456d98;
}

.item-container {
  display: flex;
  max-width: 250px;
  position: relative;
  margin-bottom: 15px;
  margin: 0 auto;
  margin-bottom: 15px;
  cursor: pointer; 
  justify-content: space-between;
  
}

.item__text {
  color: #2e5b8c;
  font-size: 1rem;
  margin: 0;
  padding: 0 5px;
  text-align: center;
  word-break: break-word;
}

input[type=checkbox] {
  visibility: hidden;
}

input[type=checkbox]:checked + p.item__text {
  text-decoration: line-through;
}

.custom-checkbox {
  position: absolute; 
  top: 0;
  left: 0;
  height: 19.5px;
  width: 19px;
  background: #fd7866;
  border-radius: 5px;
  border-bottom: .25em solid #fd6853;
}

.custom-checkbox:after {
  content: "";
  position: absolute;
  display: none;
}

.item-container input:checked ~ .custom-checkbox:after {
  display: block;
}

.item-container .custom-checkbox:after {
  left:7px;
  bottom: 3px;
  width: 3.5px;
  height: 10px;
  border: solid #456d98;
  border-width: 0 2px 2px 0;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
}

.complete {
  padding: 0 5px
}

@media (max-width: 720px) {
  .app-container {
    display: block;
  }

  .todo-container {
    max-width: 300px;
    padding-bottom: 10px; 
  }

  h1 {
    padding-top: 25px; 
  }
}