style.css

<!-- ===== STYLES ========== -->
<style>

	table {
      border-collapse: collapse;
      border-spacing: 0;
    }

    td.text,
    td.text--footer,
    .has-btn {
      mso-line-height-rule: exactly;
      -webkit-font-smoothing: antialiased;
      -ms-text-size-adjust: none;
      -webkit-text-size-adjust: none;
    }

    a[x-apple-data-detectors] {
      color: inherit !important;
      text-decoration: none !important;
      font-size: inherit !important;
      font-family: inherit !important;
      font-weight: inherit !important;
      line-height: inherit !important;
    }

    @media screen and (max-width: 600px) {
      .text {
        font-size: 14px !important;
        line-height: 21px !important;
      }
        
      .text--footer {
        font-size: 12px !important;
        line-height: 18px !important;
      }

      .h1 {
        font-size: 20px !important;
      }

      .h2 {
        font-size: 18px !important;
      }

      .h3 {
        font-size: 16px !important;
      }

      .h4 {
        font-size: 14px !important;
      }

      .h5 {
        font-size: 14px !important;
      }

      table {
        line-height: 1.5 !important;
      }

      .h1, .h2, .h3, .h4, .h5 {
        line-height: 1.2 !important;
      }

      .cs-logo {
        width: 120px !important;
      }

      .flex-size {
        max-width: 100% !important;
        width: 100% !important;
      }

      .flex-size img {
        max-width: 100% !important;
      }

      .s-height {
        height: 10px !important;
      }

      .s-db {
        display: block !important;
      }

      .s-dib {
        display: inline-block !important;
      }

      .s-hf {
        height: 0 !important;
      }

      .s-paf {
        padding: 0 !important;
      }

      .s-pbf {
        padding-bottom: 0 !important;
      }

      .s-pbm {
        padding-bottom: 16px !important;
      }

      .s-plf {
        padding-left: 0 !important;
      }

      .s-prf {
        padding-right: 0 !important;
      }

      .s-pts {
        padding-top: 8px !important;
      }

      .s-ptm {
        padding-top: 16px !important;
      }

      .s-ptl {
        padding-top: 32px !important;
      }

      .s-tac {
        text-align: center !important;
      }

      .s-tal {
        text-align: left !important;
      }
      .s-tss {
      	font-size: 12px !important;
      }
    }
    @media screen and (min-device-width: 375px) and (max-device-width: 667px) {
      .text {
        font-size: 16px !important;
      }
    }

    
</style>