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CSS

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HTML 

              
                <!DOCTYPE html>
<html lang="es">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="tareas.css">
    <title>Tareas</title>
</head>
<body>
    <h1>Lista de Tareas</h1>
    <p>
        - Aqui puedes hacer una lista de tus tareas por hacer, cada que abras la pagina puedes ver tu lista de nuevo.
    </p>
    <p>
        - Para borrar una tarea selecciónala y da click 
        en borrar.
    </p>
    <p>
        - Para dar una tarea por terminada da click sobre ella.
    </p>
   
    <div id="newGrid">
        <input id="tarea" type="text" placeholder="Escribe la tarea">
        <button id="btn-agregar">Agregar</button>
        <button id="btn-borrar">Borrar</button>
    </div>
    <ul id="lista-tareas"></ul>

<script src="tareas.js"></script>
</body>
</html>
!

CSS 

              
                body{
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: #E8E9EB;
}
h1{
    color:#F06543;
    text-align: center;
    font-size: 25px;
    
}
ul, p{
    color:#313638;
    font-size: 90%;
}
li{
    list-style-type:none;
}
button{
    background-color:#E0DFD5;
      color:#313638;
      width: 20%;
      height: 60px;
      border: 5px solid #F06543;
      float:right;
      margin-right:15%;
      margin-top: .5% 
}

#tarea{
    margin-left: 5%;
    width: 50%;
    height: 2%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
      font-size: 50px;
      margin-bottom: .5%;
      

}


@media screen 
and (max-width: 650px)
{
    #newGrid{
        display: inline-grid;
        width: 100%;
        grid-template-columns: repeat(1, 1fr);
        grid-template-rows: repeat(2,45px);
    }

    #tarea{
        grid-column: 1;
        grid-row: 1;
        width: 50%;
        height: 90%;
        margin-right: 35%;
        font-size: 100%;
        border-radius: 10px;
    }

    #btn-agregar{
        grid-column: 1;
        grid-row: 1;
        width: 30%;
        height: 90%;
        margin-left: 65%;
        border-radius: 10px;
        font-size: 120%;
    }

    #btn-borrar{
        grid-column: 1;
        grid-row: 2;
        width: 30%;
        height: 90%;
        margin-left: 65%;
        border-radius: 10px;
        font-size: 120%;
    }

    #lista-tareas{
        grid-column: 1;
        grid-row: 3;
    }
}
!

JS 

              
                var listaTareas = [];
document.getElementById('btn-borrar').onclick=borrar;
document.getElementById('btn-agregar').onclick = hacerlista;
cargaTareas();
function borrar(){
    var elementos = document.querySelectorAll('li>input');
    listaTareas2=document.getElementById('lista-tareas');
    for(var i=0;i<elementos.length;i++)
    {
        if(elementos[i].checked)
        {
            listaTareas2.removeChild(elementos[i].parentNode);
            console.log(i);
            listaTareas.splice(i,1);
        }
    }    
    localStorage.setItem('elemento', listaTareas);
    
}

function hacerlista()
{
    var Textarea = document.getElementById('tarea').value;
    agregar(Textarea);
    document.getElementById("tarea")
}

function agregar(nueva) {
   
    var elemento = document.createElement('li');
    var nodoCheck= document.createElement('input');
    nodoCheck.setAttribute('type','checkbox');
    var nodoTexto = document.createTextNode(nueva);
    elemento.appendChild(nodoCheck);
    elemento.appendChild(nodoTexto);
    var lista = document.getElementById('lista-tareas');
    lista.appendChild(elemento);
    listaTareas.push(nueva);
    localStorage.setItem('elemento', listaTareas);
    elemento.onclick = marcarTarea;
    console.log('voy agregar una tarea  ' + nueva);
}


function marcarTarea(evento) {
    evento.target.setAttribute("style","color:red");
    console.log('Tarea Completada : ' + evento.target.innerText);
}

function eliminartarea(evento) {
    
    document.getElementById('lista-tareas').removeChild(evento.target);
    var encuentra=listaTareas.indexOf(evento.target.innerText);
    if(encuentra>-1)
    {
        listaTareas.splice(encuentra,1);
    }
    localStorage.setItem('elemento',listaTareas);
    
}

function cargaTareas() {
    var nuevalistaT = [];

    if(localStorage.getItem('elemento')=="")
    {
        localStorage.clear();
    }

    if (localStorage.length > 0)
    {
       nuevalistaT = localStorage.getItem('elemento').split(',');;
    }

    for (var i = 0; i < nuevalistaT.length; i++)
    {
        agregar(nuevalistaT[i]);
    }     
}
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