.nav {
  background: #d5edff;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 5rem;
  padding-left: 10rem;
  position: fixed;
  width: 100%;
  z-index: 3;
}

.nav .welcome{
    font-family: '思源黑体 CN Bold', '思源黑体 CN Regular', '思源黑体 CN', sans-serif;
    font-weight: 700;
    font-style: normal;
    font-size: 20px;
    color: rgba(0, 0, 0, 0.968627450980392);
    width: fit-content;
    padding: 0 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

.nav .welcome:hover{
    transition: .3s all ease-in-out;
    height: 60px;
    background-color: rgba(0, 0, 0, 0.295);
}