style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}  
  .container {
    width: 100%;
    min-height: 100vh;
    /* background-color: rgb(16, 16, 47); */
    padding: 10px;
  }
  
  .todo {
    width: 100%;
    max-width: 540px;
    background-color: whitesmoke;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;
  }
  
  .todo h2 {
    color: #002765;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    user-select: none;
    font-family: 'Times New Roman', Times, serif ;
  }
  
  .row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #edeef0;
    border-radius: 30px;
    padding-left: 20px;
    margin-bottom: 25px;
  }
  
  input {
    flex: 1;
    border: none;
    outline: none;
    padding: 16px;
    background: transparent;
  }
  
  button {
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #ff5945;
    color: #ffff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
  }
  
  ul li {
    list-style: none;
    padding: 12px 8px 12px 50px;
    font-size: 18px;
    cursor: pointer;
    user-select: none;
    position: relative;
    font-family: Arial, Helvetica, sans-serif;
  }