body {
  margin: 0px;
}

header {
  background-color: rgb(109, 109, 109);
  position: fixed;
  width: 100%;
  height: 60px;
  border-bottom: 1px solid #ccc;
  padding: 10px;
}

.headerContents {
  display: flex;
  height: 100%;
  width: 100%;
}

.headerLeft {
  width: 50%;
  display: inline-block;
}

.myIcon {
  height: 100%;
  display: inline-block;
}

.Myname {
  display: inline-block;
  height: 100%;
  margin-left: 5px;
}

.Myname p {
  margin: 0;
  font-size: 225%;
  color: #FFFFFFFF;
  height: 100%;
  display: flex;
  align-items: center;
}

.headerLeft a {
  height: 100%;
  display: flex;
  width: fit-content;
  text-decoration: none;
}

.headerRight {
  width: 50%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 20px;
}

@media screen and (max-width: 768px) {
  .headerLeft {
    width: 100%;
  }

  .headerRight {
    display: none;
  }
}

main {
  padding: 100px 5% 20px;
}

@media screen and (max-width: 768px) {
  main {
    padding: 80px 5% 20px;
  }
}

.section {
  margin-bottom: 40px;
}

.sns_logos {
  display: flex;
  justify-content: space-between;
  align-items: center;
}


.waku {
  border: 1px solid #333333;
  border-radius: 10px;
  max-width: 1600px;
  width: 80%;
  margin: 0 auto;
  padding: 0 20px;
}

.center_contents {
  display: flex;
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 20px;
  justify-content: center;
  align-items: center;
}

.articles {
  width: 100%;
  text-align: center;
}

.articles a {
  display: inline-block;
  width: 45%;
  height: 100%;
  margin: 10px;
  ;
}

@media screen and (max-width: 768px) {
  .articles a {
    display: block;
    width: 100%;
    height: 100%;
    margin: 10px;
  }
}

.article {
  border: 1px solid #333333;
  border-radius: 10px;
  padding: 10px;
}

.article h2 {
  color: black;
  margin: 0px;
}

.article span {
  display: inline-block;
}

a.button {
  background-color: #498205;
  font-size: large;
  display: inline-block;
  text-align: center;
  color: white;
  font-weight: bold;
  text-decoration: none;
  padding: 12.5px 25px;
  border-radius: 10px;
}

a.button:hover {
  background-color: #3a6200;
}

.article_buttons {
  text-align: center;
}

table {
  font-size: larger;
}

@media screen and (max-width: 768px) {
  table.pc {
    display: none;
  }
}

@media screen and (min-width: 769px) {
  table.smartphone {
    display: none;
  }
}

tr {
  margin-bottom: 10px;
}

td {
  padding-bottom: 10px;
  vertical-align: top;
}

td.time {
  padding-right: 10px;
}

td.time p {
  margin: 0px;
}

td span {
  display: inline-block;
}

td.url {
  padding-left: 20px;
}

.dataScienceBadge {
  display: inline-block;
  width: 270px;
  height: 270px;
  margin: 10px;
}

footer {
  background-color: rgb(200, 200, 200);
  padding-top: 10px;
  padding-bottom: 10px;
  width: 100%;
  text-align: center;
}

#return_top {
  position: fixed;
  bottom: 10px;
  right: 10px;
  border-radius: 24px;
  z-index: 10000;
  /*普段は隠しておく*/
  opacity: 0;
  visibility: hidden;
}

#return_top.active {
  /*activeが付いたら表示*/
  opacity: 1;
  visibility: visible;
}