.company {
    width: 100%;
}
.company th {
  border-bottom: solid 1px #dee2e6;
  padding: 10px;
  width: 25%;
}
.company td {
    border-bottom: solid 1px #dee2e6;
    padding: 10px;
}

@media screen and (max-width: 640px) {
  .last td:last-child {
    border-bottom: solid 1px #ccc;
    width: 100%;
  }
  .company th,
  .company td {
　　border-bottom: none;
    display: block;
    width: 100%;
  }

  .company td {
      margin-bottom: 15px;
  }
}

.btn-mail {
    border-width: 2px;
}

.gmail-color {
    background-color: #BA3A2C;
    border-color: #BA3A2C;
    color: white;
}

.gmail-color:hover {
    color:white;
}