File: public/css/global.css

#convert_value, #currency_in, #currency_out {
    display: inline-block;
    width: auto;
    margin: 15px;
}

#convert_value {
    margin: 0;
    width: 100px;
}

#switch_currency {
    cursor: pointer;
}

.history-row {
    display: block;
    border-top-color: #bdbdbd;
    border-top-style: solid;
    border-top-width: 1px;
    font-size: 2em;
    color: #424242;
}

.wrapper {
    position: absolute;
    width: 100%;
    top: 45%;
}

#convert_form dd,
#convert_form dt {
    display: inline-block;
}

@media all and (max-width: 500px) {
    #convert_value {
        width: 40px;
    }
    .history-row {
        font-size: 2em;
    }
}