send/app/base.css

:root {
  --pageBGColor: #fff;
  --primaryControlBGColor: #0297f8;
  --primaryControlFGColor: #fff;
  --primaryControlHoverColor: #0287e8;
  --inputTextColor: #737373;
  --errorColor: #d70022;
  --linkColor: #0094fb;
  --textColor: #0c0c0d;
  --lightTextColor: #737373;
  --successControlBGColor: #05a700;
  --successControlFGColor: #fff;
}

html {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'segoe ui',
    'helvetica neue', helvetica, ubuntu, roboto, noto, arial, sans-serif;
  font-weight: 200;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'segoe ui',
    'helvetica neue', helvetica, ubuntu, roboto, noto, arial, sans-serif;
  display: flex;
  flex-direction: column;
  margin: 0;
  min-height: 100vh;
}

input,
select,
textarea,
button {
  font-family: inherit;
  margin: 0;
}

a {
  text-decoration: none;
}

.main {
  display: flex;
  flex-direction: row;
  flex: auto;
  padding: 0 20px;
  box-sizing: border-box;
}

.stripedBox {
  width: 480px;
  background-color: white;
  border-radius: 6px;
  box-shadow: 0 0 0 3px rgba(155, 155, 155, 0.4);
  background-image: repeating-linear-gradient(
    45deg,
    white,
    white 5px,
    #ea000e 5px,
    #ea000e 25px,
    white 25px,
    white 30px,
    #0083ff 30px,
    #0083ff 50px
  );
}

.mainContent {
  height: 100%;
  background-color: white;
  margin: 0 10px;
  padding: 1px 10px 0 10px; /* top wtf? */
}

.spacer {
  flex: auto;
}

.uploads {
  flex: auto;
}

.noscript {
  text-align: center;
  border: 3px solid var(--errorColor);
  border-radius: 6px;
}

.btn {
  font-size: 15px;
  font-weight: 500;
  color: var(--primaryControlFGColor);
  cursor: pointer;
  text-align: center;
  background: var(--primaryControlBGColor);
  border: 1px solid var(--primaryControlBGColor);
  border-radius: 5px;
}

.btn:hover {
  background-color: var(--primaryControlHoverColor);
}

.btn--cancel {
  color: var(--errorColor);
  background: var(--pageBGColor);
  font-size: 15px;
  border: 0;
  cursor: pointer;
  text-decoration: underline;
}

.btn--cancel:disabled {
  text-decoration: none;
  cursor: auto;
}

.btn--cancel:hover {
  background-color: var(--pageBGColor);
}

.input {
  flex: 2 0 auto;
  border: 1px solid var(--primaryControlBGColor);
  border-radius: 6px 0 0 6px;
  font-size: 20px;
  color: var(--inputTextColor);
  font-family: 'SF Pro Text', sans-serif;
  letter-spacing: 0;
  line-height: 23px;
  font-weight: 300;
  height: 46px;
  padding-left: 10px;
  padding-right: 10px;
}

.input--error {
  border-color: var(--errorColor);
}

.input--noBtn {
  border-radius: 6px;
}

.inputBtn {
  flex: auto;
  background: var(--primaryControlBGColor);
  border-radius: 0 6px 6px 0;
  border: 1px solid var(--primaryControlBGColor);
  color: var(--primaryControlFGColor);
  cursor: pointer;

  /* Force flat button look */
  /* stylelint-disable-next-line plugin/no-unsupported-browser-features */
  appearance: none;
  font-size: 15px;
  padding-bottom: 3px;
  padding-left: 10px;
  padding-right: 10px;
  white-space: nowrap;
}

.inputBtn:disabled {
  cursor: auto;
}

.inputBtn:hover {
  background-color: var(--primaryControlHoverColor);
}

.inputBtn--hidden {
  display: none;
}

.cursor--pointer {
  cursor: pointer;
}

.link {
  color: var(--linkColor);
  text-decoration: none;
}

.link:focus,
.link:active,
.link:hover {
  color: var(--primaryControlHoverColor);
}

.link--action {
  text-decoration: underline;
  text-align: center;
}

.page {
  margin: 0 auto 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  text-align: center;
}

.progressSection {
  margin: 0 auto;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  text-align: center;
  font-size: 15px;
}

.progressSection__text {
  color: var(--lightTextColor);
  letter-spacing: -0.4px;
  margin-top: 24px;
  margin-bottom: 74px;
}

.effect--fadeOut {
  opacity: 0;
  animation: fadeout 200ms linear;
}

@keyframes fadeout {
  0% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}

.effect--fadeIn {
  opacity: 1;
  animation: fadein 200ms linear;
}

@keyframes fadein {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
  }
}

.error {
  color: var(--errorColor);
}

.title {
  color: var(--textColor);
  font-size: 33px;
  line-height: 40px;
  margin: 20px auto;
  text-align: center;
  max-width: 520px;
  font-family: 'SF Pro Text', sans-serif;
  word-wrap: break-word;
}

.description {
  font-size: 15px;
  line-height: 23px;
  max-width: 630px;
  text-align: center;
  margin: 0 auto 60px;
  color: var(--textColor);
  width: 92%;
}

@media (max-device-width: 768px), (max-width: 768px) {
  .description {
    margin: 0 auto 25px;
  }
}

@media (max-device-width: 520px), (max-width: 520px) {
  .input {
    font-size: 22px;
    padding: 10px 10px;
    border-radius: 6px 6px 0 0;
  }

  .inputBtn {
    border-radius: 0 0 6px 6px;
    flex: 0 1 65px;
  }

  .input--noBtn {
    border-radius: 6px;
  }
}