body {
   margin: 0;
   padding: 0;
   background-size: cover;
   background-position: center center;
   font-family: sans-serif;
   background-repeat: no-repeat;
}
.login-box {
   width: 320px;
   height: 420px;
   background: rgba(0, 0, 0, 0.5);
   color: #fff;
   top: 50%;
   left: 50%;
   position: absolute;
   transform: translate(-50%, -50%);
   box-sizing: border-box;
   padding: 70px 30px;
}
.avatar {
   width: 100px;
   height: 100px;
   border-radius: 50%;
   position: absolute;
   top: -50px;
   left: calc(50% - 50px);
}
h1 {
   margin: 0;
   padding: 0 0 20px;
   text-align: center;
   font-size: 22px;
}
.login-box p {
   margin: 0;
   padding: 0;
   font-weight: bold;
}
.login-box input {
   width: 100%;
   margin-bottom: 20px;
}
.login-box input[type="text"], input[type="password"] {
   border: none;
   border-bottom: 1px solid #fff;
   background: transparent;
   outline: none;
   height: 40px;
   color: #fff;
   font-size: 16px;
}
.login-box input[type="submit"] {
   border: none;
   outline: none;
   height: 40px;
   background: #1c8adb;
   color: #fff;
   font-size: 18px;
   border-radius: 20px;
}
.login-box input[type="submit"]:hover {
   cursor: pointer;
   background: #39dc79;
   color: #000;
}
.login-box a {
   text-decoration: none;
   font-size: 14px;
   color: #fff;
}
.login-box a:hover {
   color: #39dc79;
}