style.css

html,body{
    width: 600px;
}

a{
    color: #f3e5f5;
}

.heading{
    text-align: center;
    cursor: pointer;
}

.author{
    color: #673ab7 ;
    font-weight: bold;
}

.info{
    display: none;
}

.loading{
    font-size: 3em;
    text-align: center;
}

ul.select-dropdown{
    min-height: 200px;
}

ul.select-dropdown > li{
    color: #512da8;
    min-height: 25px;
}

ul.select-dropdown > li > span{
    color: #512da8;
    font-size: 15px;
    padding: 5px 10px;
}

input{
    color: #512da8;
}

input.amount{
    border-color: #512da8;
}
input.amount[type=number]:focus {
     border-bottom: 1px solid #512da8;
     box-shadow: 0 1px 0 0 #512da8;
}

.button-row{
    text-align: center;
}

.button-row > div > .btn{
    width: 100%;
}

.currency-row{
    margin-bottom: 0px;
}

.row.settings-button > div{
    text-align: center;
}

#button-settings {
    width: 50%;
}

#settings {
    display: none;
}

.setting-button-cont {
    margin-top: 12px;
}