* {
  user-select: none;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

/* introContainer */
.introContainer {
  margin: 10px 60px;
}

.introContainer_content {
  margin: 40px 80px;
  padding: 40px 140px;
  border: lightgray 1px solid;
  transition: all 0.5s ease;
}

.introContainer .introContainer_content p {
  font-size: 14px;
  text-align: justify;
  text-indent: 2rem;
  transition: all 0.5s ease;
}

/* letter content */
.letter-title {
  margin-bottom: 20px;
  text-align: center;
  text-transform: uppercase;
  font-size: 30px;
  transition: all 0.5s ease;
}

.letter-first-line {
  text-indent: 2rem;
  font-size: 16px;
  margin-bottom: 10px;
  transition: all 0.5s ease;
}

.letter-last-line {
  display: flex;
  justify-content: end;
  -webkit-justify-content: flex-end;
  text-transform: uppercase;
  transition: all 0.5s ease;
}

/*responsive*/

@media screen and (max-width: 1366px) {
  .introContainer_content {
    margin: 40px 50px;
    padding: 40px 130px;
    border: lightgray 1px solid;
  }
}

@media screen and (max-width: 1280px) {
}

@media screen and (max-width: 1152px) {
  .introContainer_content {
    margin: 40px 40px;
    padding: 40px 100px;
    border: lightgray 1px solid;
  }
}

@media screen and (max-width: 1024px) {
  .introContainer_content {
    margin: 40px 30px;
    padding: 40px 80px;
    border: lightgray 1px solid;
  }
}

@media screen and (max-width: 896px) {
  .introContainer {
    margin: 10px 50px;
  }

  .introContainer_content {
    margin: 40px 20px;
    padding: 40px 70px;
    border: lightgray 1px solid;
  }

  .letter-title {
    text-align: center;
    text-transform: uppercase;
    font-size: 26px;
  }

  .letter-last-line span {
    width: 80%;
  }
}

@media screen and (max-width: 768px) {
  .introContainer {
    margin: 10px 30px;
  }

  .introContainer_content {
    margin: 40px 10px;
    padding: 40px 50px;
    border: none;
  }

  .letter-last-line span {
    width: 75%;
  }
}

@media screen and (max-width: 672px) {
  .introContainer {
    margin: 10px 20px;
  }

  .introContainer_content {
    margin: 40px 0px;
    padding: 40px 40px;
  }

  .letter-last-line span {
    width: 70%;
  }
}

@media screen and (max-width: 576px) {
  .introContainer {
    margin: 10px 10px;
  }

  .introContainer_content {
    margin: 10px 0;
  }

  .letter-last-line span {
    width: 60%;
  }
}

@media screen and (max-width: 512px) {
}

@media screen and (max-width: 448px) {
  .introContainer {
    margin: 10px 0px;
  }

  .introContainer_content {
    margin: 0;
  }

  .letter-last-line span {
    width: 40%;
  }
}