*{
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      body{
        display: flex;
        align-items: center;
        justify-content: center;
        flex-direction: column;
        padding-block: 10vh;
        background: #ddfcfe;
        font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
      }
      h2{
        margin-bottom: 20px;
      }
      .input{    
        width: 200px;
        border-radius: 10px;
        padding: 9px;
        border: 2px solid black;
        margin-right: 40px;
      }
      #btn,.del-btn{
        width: 120px;
        height: 40px;
        background: #000000;
        color: yellow; 
        border: none;
        border-radius: 20px;
        font-weight: 700;
        cursor: pointer;
        border: 2px solid black;
        transition: 500ms;
      }
      #btn:hover{
        background: inherit;
        color: black;
      }
      .del-btn{
        background: #f9f993;
        color: #000000;
      }
      .float{
        float: right;
      }
      .all-delete{
        background: #142b2b;
        color: #ffffff;
        margin-top: 20px;
        border-radius: 20px;
        padding:10px;
        width: 610px ;
        font-weight: 700;
        cursor: pointer;
        border: 2px solid black;
      }
      .todo-list-elem{
        background: #beefe4;
        margin-top: 20px;
        border-radius: 10px;
        padding: 20px 15px 20px 30px;
        width: 610px ;
      }
      .todo-list-elem>li{
        margin-block: 10px;
        list-style-type: circle ;
        line-height: 40px;
      }
      .mr{
        margin-right: 40px;        
      }

      @media screen and (max-width:655px) {
        div{
          width: 90vw;
        }
        .input, .all-delete, .todo-list-elem, #btn{
          width: 90vw;
        }

      .input{
        margin-bottom: 20px;
      }
        
      }
      @media screen and (max-width:600px) {
        .del-btn{
          float: none;
          margin-left: 15px;
        }

      }
      @media screen and (max-width:455px) {
        .todo-list-elem{
        padding: 20px 10px 20px 10px;
        }
        .del-btn{
          height: 30px;
          width: 100px;
        }
      }