body
{
  font-family: Arial;
  background: #1e293b;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container
{
    background: #334155;
    padding: 30px;
    border-radius: 10px;
    width: 350px;
    text-align: center;
}
  
input
{
    padding: 10px;
    width: 70%;
    border: none;
    border-radius: 5px;
}

button
{
    padding: 10px;
    background: #4facfe;
    border: none;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

button :hover
{
    background: #3b82f6;
}

ul
{
    margin-top: 20px;
    padding: 0;
}

li
{
    list-style: none;
    background: #1e293b;
    padding: 10px;
    margin: 10px 0;
    display: flex;
    justify-content: space-between;
    border-radius: 5px;
}

.completed
{
    text-decoration: line-through;
    color: gray;
}