.callout {
    background-color: rgb(240,240,240);
    border:1px solid rgb(200,200,200);
    border-left-width: 4px;
    padding: 1em;
    border-radius: 10px;
}
.callout.primary {
    border-left-color: #007bff;
}
.callout.success {
    border-left-color: #008000;
}
.callout.error {
    border-left-color: #ff2222;
}

.callout p:last-of-type {
    margin-bottom: 0;
}