MatrixSynapse/synapse/res/templates/sso.css

body, input, select, textarea {
  font-family: "Inter", "Helvetica", "Arial", sans-serif;
  font-size: 14px;
  color: #17191C;
}

header, footer {
  max-width: 480px;
  width: 100%;
  margin: 24px auto;
  text-align: center;
}

@media screen and (min-width: 800px) {
  header {
    margin-top: 90px;
  }
}

header {
  min-height: 60px;
}

header p {
  color: #737D8C;
  line-height: 24px;
}

h1 {
  font-size: 24px;
}

a {
  color: #418DED;
}

.error_page h1 {
  color: #FE2928;
}

h2 {
  font-size: 14px;
}

h2 img {
  vertical-align: middle;
  margin-right: 8px;
  width: 24px;
  height: 24px;
}

label {
  cursor: pointer;
}

main {
  max-width: 360px;
  width: 100%;
  margin: 24px auto;
}

.primary-button {
  border: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  text-decoration: none;
  padding: 12px;
  color: white;
  background-color: #418DED;
  font-weight: bold;
  display: block;
  border-radius: 12px;
  width: 100%;
  box-sizing: border-box;
  margin: 16px 0;
  cursor: pointer;
  text-align: center;
}

.profile {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 24px;
  padding: 13px;
  border: 1px solid #E9ECF1;
  border-radius: 4px;
}

.profile.with-avatar {
  margin-top: 42px; /* (36px / 2) + 24px*/
}

.profile .avatar {
  width: 36px;
  height: 36px;
  border-radius: 100%;
  display: block;
  margin-top: -32px;
  margin-bottom: 8px;
}

.profile .display-name {
  font-weight: bold;
  margin-bottom: 4px;
  font-size: 15px;
  line-height: 18px;
}
.profile .user-id {
  color: #737D8C;
  font-size: 12px;
  line-height: 12px;
}

footer {
  margin-top: 80px;
}

footer svg {
  display: block;
  width: 46px;
  margin: 0px auto 12px auto;
}

footer p {
  color: #737D8C;
}