styles.css

@import url('https://fonts.googleapis.com/css2?family=Montserrat:ital,wght@0,100..900;1,100..900&display=swap');

* {
    margin: 0;
    padding: 0;
    border: none;
    box-sizing: border-box;
    font-family: "Montserrat", sans-serif;
    color: #042608;
}

.content {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #faedd9;
    align-items: center;
    justify-content: center;
}

.title {
    font-weight: 600;
    line-height: 32px;
    font-size: 2.5rem;
}

.subtitle {
    font-weight: 400;
    line-height: 32px;
    font-size: 1.5rem;
}

.convert-field {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    margin: 20px 0;
}

#bin-number {
    background-color: #fff;
    padding: 5px 10px;
    border-radius: 5px;
    box-shadow: 1px 1px 5px #808f12;
    border: none;
}

#bin-number:focus {
    outline: none;
}

#btn-convert {
    background-color: #808f12;
    padding: 5px;
    border-radius: 5px;
    font-weight: 700;
    margin-left: 10px;
    cursor: pointer;
}

#btn-convert span {
    color: #FFF;
    font-size: 14px;
}

#btn-convert:disabled {
    cursor: not-allowed;
    background-color: rgba(128, 143, 18, .5);
}

#error-message, #result {
    display: none;
    font-weight: 500;
}

#error-message {
    color: #ea2a15;
}

#result, #result sub {
    color: #2a5c0b;
}

.active {
    display: block !important;
}