styles.css

body, main, .group, label, .group-input, input, button {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
}

body {
    display: flex;
    flex-direction: column;
    padding: 5px;
    font-family: Verdana;
    font-size: 12;
    color: rgba(255, 255, 255, 1);
}

.group {
    display: flex;
    flex-direction: column;
    width: 620px;
    height: 63px;
}

.br {
    height: 10px;
}

label {
    margin-bottom: 5px;
    height: 20px;
}

.group-input {
    display: flex;
    flex-direction: row;
    width: 620px;
}

input {
    padding: 5px;
    margin-right: 5px;
    width: 550px;
    min-height: 25px;
    line-height: 1.6;
    background-color: rgba(255, 255, 255, 1);
    border: 1px solid rgba(221, 221, 221, 1);
    border-radius: 4px;
    font-family: "Courier New";
    text-align: center;
}

button {
    width: 65px;
    min-height: 25px;
    line-height: 1.6;
    background-color: rgba(255, 255, 255, 1);
    border: 1px solid rgba(221, 221, 221, 1);
    border-radius: 4px;
    font-weight: bold;
}