index.css

body {
    background-color: #2c3e50;
    color: white;  
     /*transition: color .5s ease-in-out;*/
     
     display:flex;
     width:100%;
     height:100%;
     justify-content: center;
     align-items: center;
     box-sizing: border-box;
     margin: 0px;
     font-family: 'Lobster', cursive;
     font-size: 5vmin;
     text-shadow: 1px 1px 5px #2c3e50;
}

.container {
    height: 100vh; 
    display: flex;
      justify-content: center;
    align-items: center;
}

.centered {
   text-align: center;
}

.btn{
    cursor:pointer;
}

.clicked{
    color: #7f8c8d;
}

.form, .greetings{
    display:none;
}

.js-toDoList {
    font-size: 80%;
}

input[type=text]{
    width: 100%;
    border-top: none;
    border-left:none;
    border-right: none;
    border-bottom: 2px solid white;
    background-color: transparent;
    font-style: italic;
    font-family: 'Lobster', cursive;
    font-size: 5vmin;
    text-align: center;
    color: rgb(146, 144, 141);
    text-shadow: 1px 1px 5px #2c3e50;
}

input::placeholder{
    color:white;
}

.showing {
    display:block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to{
        opacity: 1;
    }
}

.bgImage{
    position: absolute;
    top: 0;
    left: 0 ;
    width: 100%;
    height: 100%;
    z-index: -1;
    animation: fadeIn 1s linear;
}