#Pr_section {
  display: flex;
  width: 50%;
  margin: 64px auto 0;
}

#Pr_section > img {
  width: 200px;
  height: 200px;
}

#ChangePic {
  animation: imgfade 4s infinite;
  opacity: 0;
}

@keyframes imgfade {
  0% {
    opacity: 0;
  }
  40% {
    opacity: 1;
  }
  70% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

.pr_text {
  width: 50%;
  margin: 0 auto;
}

.pr_h2 {
  text-align: center;
}

.pr_dl_div {
  position: relative;
}

.pr_dt {
  padding: 8px 0;
  border-bottom: 1px solid #000;
  cursor: pointer;
  user-select: none;
  font-size: .5rem;
}

.pr_dt::after {
  content: "+";
  position: absolute;
  top: 8px;
  right: 16px;
  transition: transform 0.3s;
}

.pr_dl > .pr_dl_div.appear .pr_dt::after {
  transform: rotate(45deg);
}

.pr_dd {
  padding: 8px 0;
  display: none;
  animation: 0.3s fadein;
  font-size: .5rem;
}

.pr_dl > .pr_dl_div.appear .pr_dd {
  display: block;
  color: rgb(255, 0, 0);
}

@keyframes fadein {
  0% {
    opacity: 0;
    transform: translateY(-10px);
  }

  100% {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 500px) {
  #Pr_section {
    display: flex;
    flex-direction: column;
    width: 80%;
    margin: 64px auto 0;
  }

  #Pr_section > img {
    width: 64px;
    height: 64px;
    margin: 0 auto 32px;
  }

  .pr_text {
    width: 50%;
    margin: 0 auto;
  }

  .pr_h2 {
    text-align: center;
    font-size: .5rem;
  }
}