How the HTML form block disposed outermost solid line, the broken line is arranged to cell borders?

Display interface:
As shown, the outermost border is solid, as a dashed line inside the cell borders
the following part of the HTML code portion

/ * Set the table code * /

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The following is a part of the code css
Table, TH {
border-spacing: 0em;
margin-left: 1px;
border: 1px Solid # 220 808;
border-Collapse: Collapse;
} / is provided a solid line form the outermost frame /
TH {
Color: White ;
background-Color: RGBA (38 is, 45, 59, 0.767);
}
TD {
border: 1px Dashed;
} / cell borders longitudinal dotted line /
TR {
vertical-align = left: Top;
border: 1px Dashed;
} / setting unit lateral cell borders dotted line /

Summary: cell borders (inner frame) form the outermost clear main frame (frame) and the table is determined by which part of the
frame: table
inner frame: td, tr