body {
  background-color: #f5f5f5;
}

.signin-form {
  width: 100%;
  max-width: 330px;
  padding: 15px;
  margin: auto;
  position: relative;
  z-index: 1001;
  background-color: transparent; /* Add this line */
}

.form-signin .checkbox {
  font-weight: 400;
}

.form-signin .form-floating:focus-within {
  z-index: 2;
}

.form-signin input[type="email"],
.form-signin input[type="password"] {
  margin-bottom: -1px;
  border-bottom-right-radius: 5px;
  border-bottom-left-radius: 5px;
  background-color: white; /* Add this line */
}

.form-signin button[type="submit"] {
  margin-bottom: 10px;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  background-color: white; /* Add this line */
  color: #3586ff; /* Add this line */
}

/* Animation CSS */

*{
  margin: 0;
  padding: 0;
}

section{
  position: absolute; /* Change this line */
  top: 0; /* Add this line */
  left: 0; /* Add this line */
  width: 100%;
  height: 100vh;
  background: #3586ff;
  overflow: hidden;
  z-index: 1000; /* Add this line */
}

section .air{
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100px;
  background: url(https://1.bp.blogspot.com/-xQUc-TovqDk/XdxogmMqIRI/AAAAAAAACvI/AizpnE509UMGBcTiLJ58BC6iViPYGYQfQCLcBGAsYHQ/s1600/wave.png);
  background-size: 1000px 100px;
  z-index: 1; /* Add this line */
}
section .air.air1{
  animation: wave 30s linear infinite;
  z-index: 1000;
  opacity: 1;
  animation-delay: 0s;
  bottom: 0;
}
section .air.air2{
  animation: wave2 15s linear infinite;
  z-index: 999;
  opacity: 0.5;
  animation-delay: -5s;
  bottom: 10px;
}
section .air.air3{
  animation: wave 30s linear infinite;
  z-index: 998;
  opacity: 0.2;
  animation-delay: -2s;
  bottom: 15px;
}
section .air.air4{
  animation: wave2 5s linear infinite;
  z-index: 997;
  opacity: 0.7;
  animation-delay: -5s;
  bottom: 20px;
}
@keyframes wave{
  0%{
    background-position-x: 0px;
  }
  100%{
    background-position-x: 1000px;
  }
}
@keyframes wave2{
  0%{
    background-position-x: 0px;
  }
  100%{
    background-position-x: -1000px;
  }
}