body {
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}

h1 {
    font-size: 3em;
}

h2 {
    margin-top: 2em;
}

.header {
    margin-top: 4em;
    margin-bottom: 10px;
    font-size: 30px;
}

.message {
    width: 50%;
    margin-left: auto;
    margin-right: auto;
    border-color: lightgray;
    border-style: solid;
    padding: 1rem;
    box-shadow: rgba(0, 0, 0, 0.24) 0px 2px 8px 0px;
}

.card {
    padding: 1rem;
    margin-top:0.75rem;
    margin-bottom:0.75rem;
    margin-left: auto;
    margin-right: auto;
    width: 80%;
    background-color: rgb(25, 150, 252);
    box-shadow: rgba(0, 0, 0, 0.24) 0px 2px 8px 0px;
}

.card:hover {
    color: rgb(240,240,240);
    background-color: rgb(35, 160, 255);
}

div {
    color: white;
    cursor: pointer;
}

a {
    text-decoration: none;
}

.mt {
    margin-top: 4em;
}
hr {
    width: 100%;
    border: none;
    height: 2px;
    background-color: rgb(25, 150, 252);
}

@media (min-width:900px) {
    .card {
        width: 40%;
    }
    .message {
        width: 50%;
    }
    hr {
        width: 40%;
    }
}