styles.css

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
  html {
    font-family: cursive;
  }
  body {
    background: #eee;
    padding: 0 16px;
    
  }
  .container {
    background:#b4babb;
    border-radius: 10px;
    box-shadow: 0 2px 5px #ccc;
    padding-left: 0px;
    padding-top: 0px;
    padding-right: 0px;
    padding-bottom: 150px; 
    width: 50%;
    margin-top: 50px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 100px;
    float: center;
    align-items:center;
  }
  
  header {
    background-color: #f5ba13;
    margin: auto -16px;
    padding: 16px 32px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.3);
  }
  
  header h1 {
    color: #fff;
    font-family: cursive;
    font-weight: 200;
    text-align: center;
  }
  .row{
     display:flex;
     border-radius: 10px;
     align-items: center;
     justify-content: space-between;
     background:#edeef0;
     padding-top: 5px;
     padding-left: 20px;
     padding-bottom: 5px;
  }
  input{
    flex:1;
    position:relative;
    border:none;
    outline:none ;
    background: transparent;
    height: 50px;
  }
  ::placeholder {
    color:#f5ba13;
    opacity: 1; 
  }
  button{
    border: none;
    position: relative;
    outline: none;
    padding: 15px 40px;
    background:#f5ba13;
    color:#eee;
    border-radius: 10px;
    cursor: pointer;
    font-size:16px;
    height: 50px;
  }
  ol li{
    list-style: none;
    font-size: 17px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
  } 
  ol li.checked{
    color:#555;
    text-decoration: line-through;
  }
  ol li span{
    position: absolute;
    right: 0;
    top:5px;
    width: 50px;
    height: 40px;
    font-size: 22px;
    line-height: 40px;
    column-rule-color: #555;
    text-align:center ;
  }
  ol li span:hover{
    background: #edeef0;
  }
  
  footer {
    position: relative;
    text-align: center;
    top: 100vh;;
    bottom: 0px;
    width: 100%;
    height: 2.5rem;
  }
  
  footer p {
    color: #e1ac0b;
  }

  .todo-list h2{
    font-size: 1.1em;
    margin-bottom: 6px;
  }