style.css

* {
    color: white;
    font-family: "Lilita One", sans-serif;
}

body {
    background: linear-gradient(90deg, rgba(74, 0, 0, 1) 0%, rgba(255, 0, 0, 1) 50%, rgba(255, 66, 66, 1) 80%);
}

form {
    margin-top: 10px;
}

table,
th,
td {
    border: 1px solid;
}

td{
    padding: 4px;
}

table {
    border-collapse: collapse;
}

button,
form input,
form select {
    background: none;
    border-radius: 5px;
    border: 2px white solid;
    color: white;
    transition: color .3s, background-color .2s;
}

form select * {
    color: black;
}

::placeholder {
    color: white;
    opacity: 0.75;
}

form input:focus,
form input:focus::placeholder,
form input:hover,
button:hover,
button:focus,
form select:hover,
form select:focus {
    background-color: white;
    outline: none;
    color: black;
}

#amount {
    width: 5%;
}