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

.solid {
    border: 2px solid #000;
    margin: 20px;
}

.dashed {
    border: 2px dashed #000;
    margin: 20px;
}

.rounded {
    border: 2px rounded #000;
    margin: 20px;
}

.dotted {
    border: 2px dotted #000;
    margin: 20px;
}