@import url('https://fonts.googleapis.com/css?family=Roboto');
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 62.5%;
    font-family: Roboto;
    color: #555;
}

body {
    height: 100vh;
    background-image: linear-gradient(to right bottom, #5e9ae0, #3578c6);
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    max-width: 80rem;
    padding: 3rem 4rem 4rem 4rem;
    border: 3.5rem solid #eee;
    background-color: #fff;
    box-shadow: 0 3rem 8rem rgba(0, 0, 0, .2);
    display: flex;
    flex-direction: column;
    align-items: center;
}


/****** HEADER ******/

.header {
    display: flex;
    align-items: center;
    margin-bottom: 3rem;
}

.header_logo {
    height: 7rem;
    display: inline-block;
}

.header_heading {
    font-size: 2.5rem;
}


/****** PRICE ******/

.price {
    display: flex;
    margin-bottom: 4rem;
}

.price_bought {
    margin-right: 3rem;
}

.price_label {
    display: block;
    margin-bottom: .75rem;
    font-size: 1.4rem;
}

.price_input,
.investment_btc {
    padding: 1rem;
    font-size: 1.3rem;
    border: 1px solid #ccc;
    border-radius: 3px;
    transition: all .2s;
}

.price_input::placeholder,
.investment_btc::placeholder {
    color: #ccc;
}

.price_input:focus,
.investment_btc:focus {
    color: #555;
    outline: none;
    border: 1px solid #FC9D22;
}


/****** INVESTMENT ******/

.investment {
    margin-bottom: 4rem;
    display: flex;
    align-items: center;
}

.investment>*:not(:last-child) {
    margin-right: 2rem;
}

.investment_text {
    font-size: 1.8rem;
}

.investment_btc {
    font-size: 1.8rem;
}

.investment_btn {
    display: inline-block;
    font-size: 1.6rem;
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    color: #fff;
    background-color: #3578c6;
    border: none;
    cursor: pointer;
    transition: all .2s;
}

.investment_btn:hover {
    background-color: #3578c6;
}

.investment_btn:active {
    transform: translateY(3px);
}

.investment_btn:focus {
    outline: none;
}

/****** RESULT ******/

.result {
    font-size: 1.8rem;
    font-weight: 700;
}