body {
    margin: 0;
    background-color: #272829;
    font-family:Arial, Helvetica, sans-serif
}

header {
    text-align: center;
    padding: 30px;
}

header .logo {
    width: 100px;
    border-radius: 50%;
}

header .title {
    color: #D8D9DA;
    flex: 1;
}

.cards-parent {
    display: flex;
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
}

.card {
    border: 1px solid #61677A;
    background-color: #fff;
    margin: 20px;
    width: 200px;
    height: 200px;
}

.exch-logo {
    width: 200px;
    height: 200px;
}

footer {
    background-color: #61677A;
    text-align: center;
    padding: 50px 0;
    margin-top: 50px;
    color: #D8D9DA;
}