signup.css

body{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    background: linear-gradient(to right, rgb(11, 78, 133), rgb(194, 76, 40));;
    border: 3px solid;
    border-color: royalblue;
}
.sign-up{
    width: 350px;
    position: absolute;
    top: 35%;
    left: 50%;
    transform: translate(-50%,-50%);
    color: white;
}
.sign-up h1{
    text-align: center;
    margin-bottom: 20px;
}

.sign-up input{
    width: 70%;
    border-radius: 15px;
    padding: 6px 15px;
    margin: 8px 0;
    margin-left: 50px;
    margin-bottom: 20px;
    display: inline-block;
    border:3px solid royalblue;
    box-sizing: border-box;
}
.sign-up input[type="submit"]{
    border: 0px;
    background: rgb(70, 179, 70);
    cursor: pointer;
    color: rgb(245, 229, 229);
    width: 30%;
    font-size: 18px;
    margin-left: 110px;
}
.sign-up input[type="submit"]:hover{
    background: rgb(1, 110, 1);
    transition: .5s;
}