body {
    font-family: 'Courier New', Courier, monospace;
    background: url(./blackboard.jpg);
    background-size: cover;
}

small {
    color: red;
    display: block;
    margin-top: 10px;
}

.container{
    display: grid;
    grid-template-columns: 1fr fit-content 1fr;
    grid-template-rows: repeat(1, 1fr);
    grid-auto-rows: minmax(fit-content, auto);
    grid-gap: 1em;
    align-items: center;
    grid-template-areas:
        "reader reader reader"
        "pound arrs kilo"
        "miles arrs kilometers"
        "inches arrs cmeters"
    ;
}

header {
    text-align: center;
    font-size: 2.5vh;
    padding: 10px;
    margin: 0 auto;
    margin-bottom: 10px;
    background-color: black;
    color: white;
}

.reader {
    grid-area: reader;
}

.reader__wrapper {
    display: flex;
    margin: 0 auto;
    justify-content: center;
}

.reader__wrapper article {
    width: 60%;
    font-size: 2vh;
    text-align: justify;
    padding: 0.2em 1em;
    color: white;
    background-color: black;
}

.reader__wrapper article > h2 {
    text-align: center;
}

.reader__wrapper  div{
    display: flex;
    font-size: 2em;
    padding: 0.5%;
    align-items: center;
    background-color: black;
    color: white;
}

#goleft {
    border-radius: 15px 0px 0px 15px;
    font-size: 4vh;
    transition: 0.3s;
}

#goleft:hover, #goright:hover {
    background-color: white;
    color: black;
}

#goleft:active, #goright:active {
    background-color: black;
    color: gold;
    text-shadow: 0px 0px 5px white;
    transition: 0.1s;
}

#goright {
    border-radius: 0px 15px 15px 0px;
    font-size: 4vh;
    transition: 0.6s;
}

.arrs {
    font-size: 4vh;
    text-align: center;
    color: white;
}

.pound {
    grid-area: pound;
}

.kilo {
    grid-area: kilo;
}

.miles {
    grid-area: miles;
}

.kilometers {
    grid-area: kilometers;
}

.inches {
    grid-area: inches;
}

.cmeters {
    grid-area: cmeters;
}

.pound, .kilo, .miles, .kilometers, .inches, .cmeters {
    text-align: center;
    font-size: 3vh;
    padding: 15px;
    color: white;
    text-shadow: 1px 1px 3px black;
}

.pound, .miles, .inches {
    border-radius: 15px 0px 0px 15px;
    background: linear-gradient(to right, black, rgba(0, 0, 0, 0.233));
}

.kilo, .kilometers, .cmeters {
    border-radius: 0px 15px 15px 0px;
    background: linear-gradient(to left, black, rgba(0, 0, 0, 0.233));
}

#pnd, #kg, #mil, #km, #inch, #cm {
    font-size: 3.2vh;
}

@media (max-width:550px) {
    .container {
        grid-gap: 0;
    }

    #pnd, #kg, #mil, #km, #inch, #cm {
        font-size: 1.7vh;
    }
}