h1 {
  font-size: 24px;
  font-weight: 700;
  color: #333;
}

.body {
  background-color: #4a4a4a;
}

.header-container {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  margin-bottom: 20px;
}

.container {
  box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
  background-color: rgb(249, 249, 249);
  padding: 20px;
  margin-left: 10px;
  margin-right: 10px;
  max-height: 600px;
  justify-content: center;
}

.container-visu {
  width: 70%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.container-table {
  align-items: center;
  overflow-x: auto;
}

/* remove background in periodical table */
.periodic-table {
  background-color: transparent;
  box-shadow: none;
}

.container-row {
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  padding: 10px;
  margin-bottom: 10px;
  margin-top: 10px;
}

.container-row-periodic {
  width: 100%;
  display: flex;
  flex-direction: row;
  align-items: center;
}

.container-col {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 10px;
  margin-bottom: 10px;
  margin-top: 10px;
}

body {
  font-family: "Arial", sans-serif;
  font-size: 16px;
}

.footer {
  background-color: transparent;
  font-family: "Arial", sans-serif;
  padding: 20px;
  margin-top: 10px;
  border-top: 1px solid #e0e0e0;
  border-bottom: 1px solid #e0e0e0;
  text-align: center;
}

.footer-content p {
  line-height: 1.6;
  font-size: 14px;
}

.footer-content a {
  color: #0073e6;
  text-decoration: none;
  font-weight: bold;
}

.footer-content a:hover {
  text-decoration: underline;
}

.footer-content strong {
  color: #555;
}

.main-div {
  padding-left: 20px;
  padding-right: 20px;
}

@media (max-width: 800px) {
  .main-div {
    padding-left: 30px;
    padding-right: 30px;
  }

  .container {
    width: 100%;
    margin: 5px;
    margin-top: 10px;
    margin-bottom: 10px;
  }

  .container-row {
    flex-direction: column;
  }

  .container-row-periodic {
    flex-direction: column;
  }

  .container-visu {
    width: 100%;
  }
}

@media (max-width: 1000px) and (min-width: 800px) {
  .container-visu {
    width: 100%;
  }
}