width: 500px;
height: 500px;
background:
linear-gradient(225deg, rgba(50,242,181,1) 24%, rgba(69,168,255,0) 25%) 50px -100px / 100px 100px repeat repeat, /* Top Right */
linear-gradient(135deg, rgba(50,242,181,1) 24%, rgba(69,168,255,0) 25%) 50px -100px / 100px 100px repeat repeat, /* Top Left */
linear-gradient(-45deg, rgba(50,242,181,1) 24%, rgba(69,168,255,0) 25%) 100px 0px / 100px 100px repeat repeat, /* Bottom Right */
linear-gradient(45deg, rgba(50,242,181,1) 24%, rgba(69,168,255,0) 25%) 0px 0px / 100px 100px repeat repeat; /* Bottom Left */