element月和年的选择器更改 :
结果:

/* 年月样式 */
.el-date-picker__header--bordered {
  border-bottom: 2px solid #293f6f !important;
}
.el-picker-panel {
  background-color: #040d28 !important;
}
.el-date-picker__header-label {
  color: #b1e8fd !important;
}
.el-year-table td .cell {
  color: #6ce6cb !important;
}
.el-picker-panel__icon-btn {
  background-color: #040d28 !important;
}
.el-picker-panel {
  background: url(./images/矩形.png) center center !important;
  background-size: 103% 105% !important;
}

月的和年是相同的,有一点不同,改为如下即可:

.el-month-table td .cell {
  color: #6ce6cb !important;
}