ngx-toastr/toastr-bs4-alert.scss

// Position
.toast-center-center {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.toast-top-center {
  top: 0;
  right: 0;
  width: 100%;
}
.toast-bottom-center {
  bottom: 0;
  right: 0;
  width: 100%;
}
.toast-top-full-width {
  top: 0;
  right: 0;
  width: 100%;
}
.toast-bottom-full-width {
  bottom: 0;
  right: 0;
  width: 100%;
}
.toast-top-left {
  top: 12px;
  left: 12px;
}
.toast-top-right {
  top: 12px;
  right: 12px;
}
.toast-bottom-right {
  right: 12px;
  bottom: 12px;
}
.toast-bottom-left {
  bottom: 12px;
  left: 12px;
}
.toast-container.toast-top-center .ngx-toastr,
.toast-container.toast-bottom-center .ngx-toastr {
  width: 300px;
  margin-left: auto;
  margin-right: auto;
}
.toast-container.toast-top-full-width .ngx-toastr,
.toast-container.toast-bottom-full-width .ngx-toastr {
  width: 96%;
  margin-left: auto;
  margin-right: auto;
}

// Toast
.toast-container {
  pointer-events: none;
  position: fixed;
  z-index: 999999;

  .ngx-toastr {
    @include border-radius($alert-border-radius);
    position: relative;
    overflow: hidden;
    margin: 0 0 6px;
    padding: 0.75rem 1.25rem 0.75rem 50px;
    width: 300px;
    background-position: 15px center;
    background-repeat: no-repeat;
    background-size: 24px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.03);
    pointer-events: auto;

    .toast-title {
      font-weight: bold;
    }
    .toast-message {
      word-wrap: break-word;
    }
    .toast-message a:hover {
      text-decoration: underline;
    }
    .toast-close-button {
      position: relative;
      right: -0.3em;
      top: -0.3em;
      float: right;
      font-size: 20px;
      font-weight: bold;
      color: inherit;
      text-shadow: 0 1px 0 #fff;
      opacity: 0.5;
      background: transparent;
      border: 0;
      padding: 0;
    }
    .toast-progress {
      position: absolute;
      left: 0;
      bottom: 0;
      height: 4px;
      background-color: #000000;
      opacity: 0.3;
    }
    .toast-close-button:hover,
    .toast-close-button:focus {
      color: #000000;
      text-decoration: none;
      cursor: pointer;
      opacity: 0.75;
    }
  }
  .ngx-toastr:hover {
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.15);
    opacity: 1;
    cursor: pointer;
  }
}

@function str-split($string, $separator) {
  $split-arr: ();
  // first index of separator in string
  $index: str-index($string, $separator);
  // loop through string
  @while $index != null {
    // get the substring from the first character to the separator
    $item: str-slice($string, 1, $index - 1);
    // push item to array
    $split-arr: append($split-arr, $item);
    // remove item and separator from string
    $string: str-slice($string, $index + 1);
    // find new index of separator
    $index: str-index($string, $separator);
  }
  // add the remaining string to list (the last item)
  $split-arr: append($split-arr, $string);

  @return $split-arr;
}

@function svg-factory($fill-color, $viewbox, $path) {
  $split: str-split($viewbox, ' ');
  $width: nth($split, 3);
  $height: nth($split, 4);

  // opacity is 0.9999 otherwise it uses a hex equivelent
  // firefox requires fill rgb
  @return "%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='" + $viewbox +
    "' width='" + $width + "' height='" + $height + "'%3E%3Cpath fill='" +
    rgba($fill-color, 0.999999) + "' d='" + $path + "'/%3E%3C/svg%3E";
}
@function svg-encode($svg) {
  @return 'data:image/svg+xml;charset=utf8,' + $svg;
}
.toast-success {
  /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/solid/check.svg */
  background-image: url(svg-encode(
    svg-factory(
      theme-color-level('success', 6),
      '0 0 512 512',
      'M173.898 439.404l-166.4-166.4c-9.997-9.997-9.997-26.206 0-36.204l36.203-36.204c9.997-9.998 26.207-9.998 36.204 0L192 312.69 432.095 72.596c9.997-9.997 26.207-9.997 36.204 0l36.203 36.204c9.997 9.997 9.997 26.206 0 36.204l-294.4 294.401c-9.998 9.997-26.207 9.997-36.204-.001z'
    )
  ));
  color: theme-color-level('success', 6);
  background-color: theme-color-level('success', -10);
  border: 1px solid theme-color-level('success', -9);
}
.toast-error {
  /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/solid/times-circle.svg */
  background-image: url(svg-encode(
    svg-factory(
      theme-color-level('danger', 6),
      '0 0 512 512',
      'M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8zm121.6 313.1c4.7 4.7 4.7 12.3 0 17L338 377.6c-4.7 4.7-12.3 4.7-17 0L256 312l-65.1 65.6c-4.7 4.7-12.3 4.7-17 0L134.4 338c-4.7-4.7-4.7-12.3 0-17l65.6-65-65.6-65.1c-4.7-4.7-4.7-12.3 0-17l39.6-39.6c4.7-4.7 12.3-4.7 17 0l65 65.7 65.1-65.6c4.7-4.7 12.3-4.7 17 0l39.6 39.6c4.7 4.7 4.7 12.3 0 17L312 256l65.6 65.1z'
    )
  ));
  color: theme-color-level('danger', 6);
  background-color: theme-color-level('danger', -10);
  border: 1px solid theme-color-level('danger', -9);
}
.toast-info {
  /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/solid/info-circle.svg */
  background-image: url(svg-encode(
    svg-factory(
      theme-color-level('info', 6),
      '0 0 512 512',
      'M256 8C119.043 8 8 119.083 8 256c0 136.997 111.043 248 248 248s248-111.003 248-248C504 119.083 392.957 8 256 8zm0 110c23.196 0 42 18.804 42 42s-18.804 42-42 42-42-18.804-42-42 18.804-42 42-42zm56 254c0 6.627-5.373 12-12 12h-88c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h12v-64h-12c-6.627 0-12-5.373-12-12v-24c0-6.627 5.373-12 12-12h64c6.627 0 12 5.373 12 12v100h12c6.627 0 12 5.373 12 12v24z'
    )
  ));
  color: theme-color-level('info', 6);
  background-color: theme-color-level('info', -10);
  border: 1px solid theme-color-level('info', -9);
}
.toast-warning {
  /* https://github.com/FortAwesome/Font-Awesome-Pro/blob/master/advanced-options/raw-svg/solid/exclamation-triangle.svg */
  background-image: url(svg-encode(
    svg-factory(
      theme-color-level('warning', 6),
      '0 0 576 512',
      'M569.517 440.013C587.975 472.007 564.806 512 527.94 512H48.054c-36.937 0-59.999-40.055-41.577-71.987L246.423 23.985c18.467-32.009 64.72-31.951 83.154 0l239.94 416.028zM288 354c-25.405 0-46 20.595-46 46s20.595 46 46 46 46-20.595 46-46-20.595-46-46-46zm-43.673-165.346l7.418 136c.347 6.364 5.609 11.346 11.982 11.346h48.546c6.373 0 11.635-4.982 11.982-11.346l7.418-136c.375-6.874-5.098-12.654-11.982-12.654h-63.383c-6.884 0-12.356 5.78-11.981 12.654z'
    )
  ));
  color: theme-color-level('warning', 6);
  background-color: theme-color-level('warning', -10);
  border: 1px solid theme-color-level('warning', -9);
}

// Responsive Design
@media all and (max-width: 240px) {
  .toast-container .ngx-toastr.div {
    padding: 8px 8px 8px 50px;
    width: 11em;
  }
  .toast-container .toast-close-button {
    right: -0.2em;
    top: -0.2em;
  }
}
@media all and (min-width: 241px) and (max-width: 480px) {
  .toast-container .ngx-toastr.div {
    padding: 8px 8px 8px 50px;
    width: 18em;
  }
  .toast-container .toast-close-button {
    right: -0.2em;
    top: -0.2em;
  }
}
@media all and (min-width: 481px) and (max-width: 768px) {
  .toast-container .ngx-toastr.div {
    padding: 15px 15px 15px 50px;
    width: 25em;
  }
}