style.css

html, body, select, option, input {
    background-color: #212121;
}
h1, h2, h3, p {
    color: white;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin-left: 10%;
}
.request0 {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: auto;
    margin-bottom: auto;
}
select {
    color: white;
    border: solid white;
}
input {
    width: 70%;
    margin-left: 10px;
    margin-right: 10px;
    color: white;
    border: solid white;
}
button {
    background-color: #6BDD9A;
    color: white;
    border: solid white;
}
a {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #6BDD9A;
    color: white;
    border: solid white;
    margin-left: 10%;
    text-decoration: none;
}
a, select, input, button {
    padding: 10px;
}
a, select, button {
    border-radius: 5%;
}
#home {
    margin: 10px;
    background-color: #212121;
}
#ma {
    margin: 10px;
    background-color: #212121;
    border: none;    
}
#response0 {
    padding: 5px;
    width: 80%;
    background-color: #171717;
    color: white;
    font-family: monospace;
    margin-left: 10%;
}
#card {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    margin-left: 10%;
}
#hp {
    border: #212121;
    background-color: #212121;
    text-decoration: underline;
}