style.css

*{
    margin: 0;
    padding:0;
    box-sizing: border-box;
}
body{
    display:flex;
    font-family:fantasy;
    font-weight: 100;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: blue;
}

.container{
    height:100vh;
    width: 30em;
    display:flex;
    flex-flow: column ;
    justify-content: center;
    align-items: center;
}

.Add{
     width: 30em;
     display:flex;
     flex-flow: row nowrap ;
     
}

.Add input {
    width: 24em;
    height: 3.5em;
    padding:0.4em;
    margin-left: 3.5em;
    border: 1px solid #fff;
    border-radius:0.3em;
}

.Add  .addbtn  {
    align-self: center;
    border: 1px solid #000;
    border-radius:0.2em;
    background-color: transparent;
    padding:0.3em;
    margin-left: 0.5em;
    height:2.5em;
}
.Add  .addbtn:hover{
    background-color:#fff;
    transform:scale(1.1);
}


.Add input:focus{
   outline:none;
}

.btn {
    border: 1px solid #000;
    border-radius:0.3em;
    background-color: transparent;
    padding:0.4em;
}
.container h1,.container h2{
    font-size:3em;
    font-family:fantasy;
    margin: 0.5em 0;
    font-weight: 400;
    letter-spacing: 0.1em;
}
.container h2{
    font-size:2em;
    font-family:fantasy;
    font-weight: 400;
    letter-spacing: 0.1em;
}

.list ul {
     width: 30em;
     display:flex;
     flex-flow: column nowrap ;
     justify-content: space-evenly;
     align-items: center;
     margin: 1.2em 0em;
     list-style:none;
}


.list ul li {
    width: 24em;
    display:flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 0.3em;
    background-color: #fff;
    border: 1px solid #fff;
    border-radius:0.3em;
    margin:0.8em 0.3em;
}


.btn:hover{
    background-color: blue;
    transform:scale(1.2);
}