Elimina el color de fondo predeterminado de la tercera tabla el, el elemento principal penetra

 .el-table, .el-table__expanded-cell {
    
    
        background-color: transparent!important;
    }
    
    .el-table th, .el-table tr {
    
    
       border: 0!important;
        background-color: transparent!important;
    }
    .父元素>>> .el-table,
.父元素 >>> .el-table__expanded-cell {
    
    
  background-color: transparent !important;
}

.父元素 >>> .el-table th,
.父元素>>> .el-table tr {
    
    
  border: 0 !important;
  background-color: transparent !important;
}

Elimina el color de fondo cruzado del elemento principal
. Elemento principal >>> .el-table { background: # dff0d8! Important; margin-top: 10px; margin: 0 auto; margin-left: 20%; } . Elemento principal> >> .el-table-column { ancho: 90%; background: none; margin: 0 auto; } . Elemento principal >>> .el-table ,. Elemento principal >>> .el-table__expanded-cell { background - color: transparente! importante; }

. 父 元素 >>> .el-table th,
.header_time >>> .el-table tr { border: 0! Important; color de fondo: transparente! importante; } . 父 元素 >>>. El-table tbody tr td { background: # dff0d8! Important; } . 父 元素 >>> .el-table tbody tr: hover> td { background: # dff0d8! Important; } . 父 元素 >>> .el-table__header-wrapper { background: # dff0d8! Important; } . 父 元素 >>> .el-table ， .header_time >>>. El-table__footer-wrapper tbody td { background: # dff0d8! Important; } . 父 元素 >>> .el-table__row { background: # dff0d8! Important; }