HTMLify

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}
html{
    display: table;
    margin: auto;
}
body{
    width: 80vw;
    display: flex;
    flex-direction: column;
    background-color: #18172F;
}
h1{
    color: #fff;
    font-size: 2.5rem;
    margin:10px 0px;
    text-align: center;
}
form{
    color: #fff;
    text-align: center;
}
#entry{
    width: 100%;
    margin: 10px 0px;
    background-color: #dacce6;
    border: 3px solid #fff;
    border-radius: 10px;
    padding: 10px;
    font-size: 1rem;
}
#key{
    margin: 10px 10px;
    background-color: #dacce6;
    border: 3px solid #fff;
    border-radius: 10px;
    font-size: 1rem;
    padding: 5px;
}
form label{
    font-size: 1.3rem;
}

.button-flex{
    display: flex;
    justify-content: center;
}

button{
    margin: 10px 0px;
    padding: 12px 15px;
    color: #000000;
    background-color: #BB87FD;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
}
button:hover{
    background-color: #754aad;
    
}
#decrypt{
    margin-left: 5px;
}
output{
    width: 100%;
    margin: 10px 0px;
    background-color: #dacce6;
    border: 3px solid #fff;
    border-radius: 10px;
    padding: 10px;
    font-size: 1rem;
    display: none;
}