metamask-extension/ui/app/css/itcss/components/modal.scss

// Buy Modal
.buy-modal-content {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-family: 'DIN OT';
}

@media screen and (max-width: 575px) {
  .buy-modal-content-title-wrapper {
    justify-content: space-around;
    width: 100%;
    height: 100px;
  }

  .buy-modal-content-title {
    font-size: 26px;
    margin-top: 15px;
  }

  .buy-modal-content-options {
    flex-direction: column;
    padding: 5% 33%;
  }

  .buy-modal-content-footer {
    text-transform: uppercase;
    width: 100%;
    height: 50px;
  }

  div.buy-modal-content-option {
    display: flex;
    flex-direction: column;
    width: 80vw;
    height: 15vh;
    margin: 10px;
    text-align: center;
    border-radius: 6px;
    border: 1px solid $black;
    padding: 0% 7%;
    justify-content: space-around;

    div.buy-modal-content-option-title {
      font-size: 20px;
    }

    div.buy-modal-content-option-subtitle {
      font-size: 16px;
    }
  }
}

@media screen and (min-width: 576px) {
  .buy-modal-content-title-wrapper {
    justify-content: space-around;
    width: 100%;
    height: 110px;
  }

  .buy-modal-content-title {
    font-size: 26px;
    margin-top: 15px;
  }

  .buy-modal-content-footer {
    text-transform: uppercase;
    width: 100%;
    height: 50px;
  }

  .buy-modal-content-options {
    flex-direction: row;
    margin: 20px 0;
  }

  div.buy-modal-content-option {
    display: flex;
    flex-direction: column;
    width: 20vw;
    height: 18vw;
    text-align: center;
    border-radius: 6px;
    border: 1px solid $black;
    margin: 0 .5vw;
    justify-content: space-around;

    div.buy-modal-content-option-title {
      font-size: 20px;

      @media screen and (max-width: 679px) {
        font-size: 14px;
      }

      @media screen and (min-width: 1281px) {
        font-size: 26px;
      }
    }

    div.buy-modal-content-option-subtitle {
      font-size: 16px;
      padding: 0 10px;
      height: 25%;

      @media screen and (max-width: 679px) {
        font-size: 10px;
        padding: 0 10px;
        margin-bottom: 5px;
        line-height: 15px;
      }

      @media screen and (min-width: 680px) {
        font-size: 14px;
        padding: 0 4px;
        margin-bottom: 2px;
      }

      @media screen and (min-width: 1281px) {
        font-size: 20px;
        padding: 0;
      }
    }

    div.buy-modal-content-footer {
      margin-top: 8vh;
    }
  }
}

// Edit Account Name Modal
.edit-account-name-modal-content {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  position: relative;
}

.edit-account-name-modal-cancel {
  position: absolute;
  top: 12px;
  right: 20px;
  font-size: 25px;
}

.edit-account-name-modal-title {
  margin: 15px;
}

.edit-account-name-modal-save-button {
  width: 33%;
  height: 45px;
  margin: 15px;
  font-weight: 700;
  margin-top: 25px;
}

.edit-account-name-modal-input {
  width: 90%;
  height: 50px;
  text-align: left;
  margin: 10px;
  padding: 10px;
  font-size: 18px;
}

// Account Details Modal
.account-details-modal-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  position: relative;
  padding: 5px 0;
  border-radius: 4px;
}

.account-details-modal-wrapper .qr-header {
  margin-top: 15px;
}

.account-details-modal-wrapper .qr-wrapper {
  margin-top: 15px;
}

.account-details-modal-wrapper .ellip-address-wrapper {
  display: flex;
  justify-content: center;
  border: 1px solid $alto;
  padding: 5px 10px;
}

.account-details-modal-wrapper .btn-clear {
  min-height: 28px;
  font-size: 1em;
  border-color: $curious-blue;
  color: $curious-blue;
  border-radius: 2px;
  flex-basis: 100%;
  width: 75%;
  margin-top: 10px;
  margin-bottom: 10px;
  padding: 10px;
}

.account-details-modal-divider {
  width: 100%;
  height: 1px;
  margin: 10px 0;
  background-color: $alto;
}

.account-details-modal-wrapper .identicon {
  margin-top: -55.5%;
}

.account-details-modal-close::after {
  content: '\00D7';
  font-size: 1.5em;
  color: $alto;
  position: absolute;
  top: 5px;
  right: 10px;
}

// New Account Modal
.new-account-modal-wrapper {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  position: relative;
  border: 1px solid $alto;
  box-shadow: 0 0 2px 2px $alto;
}

.new-account-modal-header {
  background: $wild-sand;
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 30px;
  font-size: 22px;
  color: $nile-blue;
}

.modal-close-x::after {
  content: '\00D7';
  font-size: 2em;
  color: $dusty-gray;
  position: absolute;
  top: 25px;
  right: 17.5px;
  font-family: sans-serif;
}

.new-account-modal-content {
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 13px;
  font-size: 18px;
  color: $nile-blue;
}

.new-account-modal-content.import {
  padding-top: 2px;
}

.new-account-input-wrapper {
  display: flex;
  width: 100%;
  justify-content: center;
  padding-bottom: 2px;
}

.new-account-input {
  padding: 15px;
  padding-bottom: 20px;
  border-radius: 8px;
  border: 1px solid $alto;
  width: 70%;
  font-size: 1em;
  color: $alto;
}

// For reference on below placeholder selectors: https://stackoverflow.com/questions/2610497/change-an-html5-inputs-placeholder-color-with-css
.new-account-input::-webkit-input-placeholder {
  color: $dusty-gray;
}

.new-account-input:-moz-placeholder {
  color: $dusty-gray;
  opacity: 1;
}

.new-account-input::-moz-placeholder {
  color: $dusty-gray;
  opacity: 1;
}

.new-account-input:-ms-input-placeholder {
  color: $dusty-gray;
}

.new-account-input::-ms-input-placeholder {
  color: $dusty-gray;
}

.new-account-modal-content.button {
  padding-top: 9px;
}

.new-account-modal-wrapper .btn-clear {
  font-size: 14px;
  font-weight: 700;
  background: $white;
  border: 1px solid;
  border-radius: 2px;
  width: 30%;
  color: $tundora;
}