* {
  box-sizing: border-box;
}
body {
  margin:0;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  font-family: 'Lato', sans-serif;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  color:#555;
  background: #ecf0f3;
  background: linear-gradient(180deg, #ecf0f3, #cbced1)
}
.login-div {
  width: 430px;
  height: 700px;
  padding: 60px 35px 35px 35px;
  border-radius: 40px;
  background: #ecf0f3;
  box-shadow: 13px 13px 20px #cbced1, 
            -13px -13px 20px #ffffff;
}
.logo {
  background: url("logo-pb.png");
  width: 100px;
  height: 100px;
  border-radius: 50%;
  margin: 0 auto;
  box-shadow: 
  /*logo shadow*/
  0px 0px 5px #5f5f5f,
  /*offset*/
  0px 0px 3px 5px #ecf0f3,
  /*bottom right*/
  8px 8px 15px #a7aaaf,
  /*top left*/
  -8px -8px 15px #ffffff;
}
.title {
  text-align: center;
  font-size: 28px;
  padding-top: 24px;
  letter-spacing: 0.5px;
}
.sub-title {
  text-align: center;
  font-size: 15px;
  padding-top: 7px;
  letter-spacing: 3px;
}
.fields {
  width: 100%;
  padding: 75px 5px 5px 5px;
}
.fields input {
  border: none;
  outline: none;
  background: none;
  font-size: 18px;
  color: #555;
  padding: 20px 10px 20px 5px;
}
.username, .password {
  margin-bottom: 30px;
  border-radius: 25px;
  box-shadow: inset 8px 8px 8px #cbced1,
          inset -8px -8px 8px #fff;
}
.fields svg {
  height: 22px;
  margin: 0px 10px -3px 25px;
}
/*Outline differs from borders! Unlike border, the outline is drawn outside the element's border, and may overlap other content. Also, the outline is NOT a part of the element's dimensions; the element's total width and height is not affected by the width of the outline. 
https://www.w3schools.com/css/css_outline.asp*/
.signin-button {
  outline: none;
  border: none;
  cursor: pointer;
  width: 100%;
  height: 60px;
  border-radius: 30px;
  font-size: 20px;
  font-weight: 700;
  font-family: 'Lato', sans-serif;
  color: #fff; 
  text-align: center;
  background: #24cfaa;
  box-shadow: 3px 3px 8px #b1b1b1,
            -3px -3px 8px #ffffff; 
  transition: 0.3s;
}
.signin-button:hover {
  background: #2fdbb6;
}
/*any element becomes active when you click on it*/
.signin-button::active {
  background: #1da88a;
}
.link {
  padding-top: 20px;
  text-align: center;
}
.link a {
  text-decoration: none;
  color: #aaa;
  font-size: 15px;
}