welcome_style.css

body {
  margin: 0;
  padding: 0;
  background-image: url("other_pic.jpg"); 
  background-size: 1550px;
  font-family: Trebuchet MS;
  height: 100vh;
  overflow-y: scroll;
  position: relative;
  box-sizing: border-box;
}

.header {
  padding-top: 10px;
  padding-bottom: 50px;  /*some padding */
  height: 50px;
  background: #051426;
  text-align: center; /* center the text */
  font-size: 20px;
  font-family: Georgia;
  color: white;
  letter-spacing: 2px;
}

.left {
  padding: 50px;
  padding-top: 200px;
  text-align: center;
  position: absolute;
  color: white;
}

.sign-in {
  position: relative;
  top: 40%;
  left: 75%;
  transform: translate(-50%, -50%);
  width: 300px;
  background-color: white;
  border-radius: 10px;
  box-shadow: 0 0 3px 0 #051426;
}

.sign-in h1 {
  text-align: center;
  padding: 10px 0 10px 0;
  border-bottom: 1px solid silver;
  color:#051426;
}

.sign-in form {
  padding: 20px;
  box-sizing: border-box;
}

.form {
  padding: relative;
  box-sizing: border-box;
}

form .txt_field {
  position: relative;
  border-bottom: 2px solid #adadad;
  margin: 30px 0;
}

.txt_field input {
  width: 100%;
  padding: 0 5px;
  height: 40px;
  font-size: 16px;
  border: none;
  background: none;
  outline: none;
}

.txt_field label {
  position: absolute;
  top: 50%;
  left: 5px;
  color: #adadad;
  transform: translateY(-50%);
  pointer-events: none;
}

.txt_field span::before {
  content: "";
  position: absolute;
  top: 40px;
  left: 0;
  width: 100%;
  height: 2px;
  background: #adadad;
  transition: 0.5s;
}

.txt_field input:focus ~ label,
.txt_field input:valid ~ label {
  top: -5px;
  color: #1B1B3B;
}

.txt_field input:focus ~ span::before,
.txt_field input:valid ~ span::before {
  width: 100%;
}

.pass {
  margin: -5px 0 20px 5px;
  color: #051426;
  cursor: pointer;
}

.pass:hover {
  text-decoration: underline;
}

input[type="submit"] {
  width: 100%;
  height: 50px;
  border: 1px solid;
  background-color: #051426;
  border-radius: 25px;
  font-size: 18px;
  color: white;
  font-weight: 300;
  font-family: Trebuchet MS;
  cursor: pointer;
  outline: none;
}

input[type="submit"]:hover {
  border-color: #051426;
  transition: 0.5s;
}

.signup_link {
  margin: 30px 0 0 0;
  text-align: center;
  font-size: 16px;
  color: #666666; 
}

.signup_link a {
  color: #5D5DBB;
  text-decoration: none;
}

.signup_link a:hover {
  text-decoration: underline;
}

.footer {
  left: 0;
  bottom: 0;
  width: 100%; 
  height: 60px;
  top: 100%;
  text-align: center; 
  background: #051426;
  color: white;  
  position: absolute;
  overflow: auto;
  padding-top: 5px;
}