div.introtext {
    font-size: 5vw;   
}

form {
    display: inline;
}
label {
    display: inline;
}

input#player_name {
    /*
-webkit-appearance: none;*/
border: 4px black solid;
border-radius: 15px;
font-size: 4vw; 
color: black;
}

button {
    -webkit-appearance: none;
    font-size: 4vw;
    background-color: white;
    border: 4px black solid;
    border-radius: 15px;
    color:black;
}