html - Impact of td/th background over table border -

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i have table element border:

.summary-table {     font-family: sans-serif;     -webkit-font-smoothing: antialiased;     font-size: 115%;     overflow: auto;     width: 100%;     border: 1px solid rgb(195, 195, 195) !important;     border-radius: 4px;     overflow: hidden; }

when use background color on thead tr works fine

.summary-table thead tr{     background-color: #e8e8e8 !important; }

enter image description here

but when use background color on thead th (no border-top , left ):

.summary-table th {     background-color: #e8e8e8 !important;     font-weight: normal;     color: black;     padding: 20px 30px; }

enter image description here

can tell nme why this?


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