* {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

div {
    margin-bottom: 15px;
    padding: 4px 12px;
}

.danger {
    background-color: #ffdddd;
    border-left: 6px solid #f44336;
}

.success {
    background-color: #ddffdd;
    border-left: 6px solid #4CAF50;
}
  
.info {
    background-color: #e7f3fe;
    border-left: 6px solid #2196F3;
}
 
.warning {
    background-color: #ffffcc;
    border-left: 6px solid #ffeb3b;
}