Mailspring/internal_packages/feedback/stylesheets/main.less

@import "ui-variables";
@import "ui-mixins";

.btn-feedback {
  position: fixed;
  bottom: 10px;
  right: 10px;
  background: linear-gradient(to bottom, @blue 0%,darken(@blue, 10%) 100%);
  width:50px;
  height:50px;
  border-radius:25px;
  display: inline-block;
  font-size: 30px;
  text-align: center;
  line-height:50px;
  color:rgba(255,255,255,0.9);
  border: 1px solid darken(@blue, 20%);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
  cursor: default;
}
.btn-feedback:hover {
  color:rgba(255,255,255,1);
  background: linear-gradient(to bottom, lighten(@blue,5%) 0%, darken(@blue, 5%) 100%);
}
.btn-feedback:active {
  background: linear-gradient(to bottom, darken(@blue,20%) 0%, darken(@blue, 10%) 100%);
}

@keyframes bounce {
  46% {right: 10px; animation-timing-function: ease-in;}
  50% {right: 35px; animation-timing-function: ease-in;}
  55% {right: 10px; width: 50px; animation-timing-function: ease-out;}
  58% {right: 3px;  width: 48px; animation-timing-function: ease-in;}
  61% {right: 10px; width: 50px; animation-timing-function: ease-out;}
  63% {right: 14px; animation-timing-function: ease-in;}
  65% {right: 10px; animation-timing-function: ease-out;}
}

.btn-feedback.newmsg{
  background: linear-gradient(to bottom, #F55 0%,darken(#F55, 10%) 100%);
  border: 1px solid darken(#F55, 20%);
}
.btn-feedback.newmsg:not(:hover):not(:active){
  animation: bounce 3s ease-in-out 0s infinite;
}
.btn-feedback.newmsg:hover {
  color:rgba(255,255,255,1);
  background: linear-gradient(to bottom, lighten(#F55,5%) 0%, darken(#F55, 5%) 100%);
}
.btn-feedback.newmsg:active {
  background: linear-gradient(to bottom, darken(#F55,20%) 0%, darken(#F55, 10%) 100%);
}