在CSS中，我們可以使用border-style屬性來設置邊框的樣式，包括實線、虛線等。border-width屬性可以用來設置邊框的寬度，下面是一些示例代碼，展示如何設置邊框為虛線并調(diào)整粗細：

/* 設置邊框為虛線 */
.dashed-border {
  border-style: dashed;
}
.dotted-border {
  border-style: dotted;
}
/* 調(diào)整邊框粗細 */
.thin-border {
  border-width: 1px;
}
.medium-border {
  border-width: 2px;
}
.thick-border {
  border-width: 3px;
}

在HTML中使用這些類來應用不同的邊框樣式和粗細：

<div class="dashed-border thin-border">Dashed Border with Thin Width</div>
<div class="dashed-border medium-border">Dashed Border with Medium Width</div>
<div class="dashed-border thick-border">Dashed Border with Thick Width</div>
<div class="dotted-border thin-border">Dotted Border with Thin Width</div>
<div class="dotted-border medium-border">Dotted Border with Medium Width</div>
<div class="dotted-border thick-border">Dotted Border with Thick Width</div>

這樣，你就可以在CSS中輕松設置和調(diào)整邊框的虛線樣式和粗細了。