index.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: 300ms all;
}
html,body{
    height: 100%;
}

body{
    display: flex;
    flex-direction: column;
    justify-content: space-evenly;
    align-items: center;
}
h2{
    background-color: black;
    line-height: 1.5;
    padding: 0 25px;
    color: white;
}

button{
    padding: 20px;
    font-size: 1.5em;
    border: 2px dashed;
    background-color: white;
    border-radius: 10px;
    text-transform: capitalize;
    font-weight: 800;
    cursor: pointer;
}

input{
    width: 380px;
    border-radius: 8px;
    background-color: white;
    border: 2px solid #efefef;
    box-shadow: 0 0 8px 0 #efefef,
                inset 0 0 7px 0 rgba(0, 0, 0, 0.24);
    padding: 10px 25px;
    font-size: 1.4em;
    text-align: center;
}